1樓:
都是一些提公因式的題,比較簡單.我用手機上的,在這裡舉個例子就好.比如第九題,可將六十五換成六十四加一,分別乘,.其實簡便演算法主要是靠參悟,沒什麼固定的方法
2樓:匿名使用者
一、脫式計算
(1)50+160÷40 (2)120-144÷18+35 (3)347+45×2-4160÷52
(4)(58+37)÷(64-9×5) (5)95÷(64-45) (6)178-145÷5×6+42
(7)812-700÷(9+31×11) ( 8)85+14×(14+208÷26)
(9)(284+16)×(512-8208÷18) (10)120-36×4÷18+35
(11)(58+37)÷(64-9×5) (12)(6.8-6.8×0.55)÷8.5
(13)0.12× 4.8÷0.12×4.8 (14)(3.2×1.5+2.5)÷1.6
(15)3.2×(1.5+2.
5)÷1.6 (16)6-1.6÷4 (17)7.
2÷0.8-1.2×5
(18)6.5×(4.8-1.2×4) (19)0.68×1.9+0.32×1.9
(20)10.15-10.75×0.4-5.7 (21)5.8×(3.87-0.13)+4.2×3.74
(22)32.52-(6+9.728÷3.2)×2. (23)(136+64)×(65-345÷23)
(24) 420+580-64×21÷28 (25)(58+370)÷(64-45)
二、用梯等式計算
⑴6.9+4.8+3.
1 ⑵ 0.456+6.22+3.
78 ⑶15.89+(6.75-5.
8)×6
⑷4.02+5.4+0.
98 ⑸5.17-1.8-3.
2 ⑹ 13.75-(3.75+6.
48)×6
⑺3.68+7.56-2.
68 ⑻7.85+2.34-0.
85+4.66 ⑼35.6-1.
8-15.6-7.2
⑽3.82+2.9+0.
18+9.1 ⑾9.6+4.
8-3.6 ⑿ 7.14-0.
53-2.47
⒀5.27+2.86-0.
66+1.63 ⒁13.35-4.
68+2.65 ⒂73.8-1.
64-13.8-5.36
⒃47.8-7.45+8.
8 ⒄0.398+0.36+3.
64 ⒅ 15.75+3.59-0.
59+14.25
⒆66.86-8.66-1.34 ⒇ 0.25×16.2×4 (1.25-0.125)×8
三、能簡便的要簡便算
⑴3.6×102 ⑵ 3.72×3.
5+6.28×3.5 ③36.
8-3.9-6.1
④15.6×13.1-15.6-15.6×2.1 ⑤ 4.8×7.8+78×0.52 ⑥ 32+4.9-0.9
4.8×100.1 ⑧56.
5×9.9+56.5 ⑨7.
09×10.8-0.8×7
⑽25.48-(9.4-0.
52) ⑾ 4.2÷3.5 ⑿ 320÷1.
25÷8
⒀18.76×9.9+18.
76 ⒁ 3.52÷2.5÷0.
4 ⒂ 3.9-4.1+6.
1-5.9
⒃5.6÷3.5 ⒄ 9.
6÷0.8÷0.4 ⒅ 4.
2×99+4.2
⒆17.8÷(1.78×4) ⒇ 0.
49÷1.4 1.25×2.
5×32 3.65×10.1
15.2÷0.25÷4 0.
89×100.1 146.5-(23+46.
5)3.83×4.56+3.
83×5.44 4.36×12.
5×8 9.7×99+9.7
27.5×3.7-7.
5×3.7 8.54÷2.
5÷0.4 0.65×101 3.
2×0.25×12.5
(45.9-32.7)÷8÷0.
125 3.14×0.68+31.
4×0.032 5.6÷1.
25÷0.8÷2.5÷0.
47.2×0.2+2.
4×1.4 8.9×1.
01 7.74×(2.8-1.
3)+1.5×2.2
3.9×2.7+3.
9×7.3 18-1.8÷0.
125÷0.8 12.7×9.
9+1.27
21×(9.3-3.7)-5.
6 15.02-6.8-1.
02 5.4×11-5.4
2.3×16+2.3×23+2.3 9.43-(6.28-1.57) 3.65×4.7-36.5×0.37
46×57+23×86 13.7×0.25-3.7÷4 2.22×9.9+6.66×6.7
101×0.87-0.91×87 10.7×16.1-15.1×10.7 0.79×199
4.8+8.63+5.2+0.37 5.93+0.19+2.81 1.76+0.195+3.24
2.35+1.713+0.287+7.65 1.57+0.245+7.43 6.02+3.6+1.98
0.134+2.66+0.866 1.27+3.9+0.73+16.1 7.5+4.9-6.5
3.07-0.38-1.62 1.29+3.7+2.71+6.3 8-2.45-1.5
3.25+1.79-0.59+1.75 23.4-0.8-13.4-7.2 0.32×403
3.2+0.36+4.8+1.64 1.23+3.4-0.23+6.6 0.25×36
12.7-(3.7+0.84) 36.54-1.76-4.54 0.25×0.73×5
7.6×0.8+0.2×7.6 0.85×199 0.25×8.5×4
1.28×8.6+0.72×8.6 12.5×0.96×0.8 10.4-9.6×0.5
0.8×(4.3×1.25) 3.12+3.12×99 28.6×101-28.3
0.86×15.7-0.86×14.7 2.4×102 2.31×1.2×0.5
14-7.32-2.68 2.64+8.67+7.36+11.33 70÷28
(2.5-0.25)×0.4 9.16×1.5-0.5×9.16 3.6-3.6×0.5
63.4÷2.5÷0.4 4.9÷1.4 3.9÷(1.3×5)
(7.7+1.54)÷0.7 2.5×2.4 2.7÷45 15÷(0.15×0.4)
0.35×1.25×2×0.8 32.4×0.9+0.1×32.4 15÷0.25
4.5÷1.8
1.18.1+(3-0.
299÷0.23)×12.(6.
8-6.8×0.55)÷8.
53.0.12× 4.
8÷0.12×4.84.
(3.2×1.5+2.
5)÷1.6 (2)3.2×(1.
5+2.5)÷1.65.
6-1.6÷4= 5.38+7.
85-5.37=6.7.
2÷0.8-1.2×5= 6-1.
19×3-0.43=7.6.
5×(4.8-1.2×4)= 0.
68×1.9+0.32×1.
98.10.15-10.
75×0.4-5.79.
5.8×(3.87-0.
13)+4.2×3.7410.
32.52-(6+9.728÷3.
2)×2.511.[(7.
1-5.6)×0.9-1.
15] ÷2.512.5.
4÷[2.6×(3.7-2.
9)+0.62]13.12×6÷(12-7.
2)-614.12×6÷7.2-615.
33.02-(148.4-90.
85)÷2.516.15-10.
75×0.4-5.717.
18.1+(3-0.299÷0.
23)×118.(6.8-6.
8×0.55)÷8.519.
0.12× 4.8÷0.
12×4.820.(3.
2×1.5+2.5)÷1.
621.3.2×6+(1.
5+2.5)÷1.622.
0.68×1.9+0.
32×1.923.10.
15-10.75×0.4-5.
724.5.8×(3.
87-0.13)+4.2×3.
7425.32.52-(6+9.
728÷3.2)×2.526.
[(7.1-5.6)×0.
9-1.15] ÷2.527.
5.4÷[2.6×(3.
7-2.9)+0.62]28.
12×6÷(12-7.2)-629.12×6÷7.
2-630.33.02-(148.
4-90.85)÷2.531.
(58+37)÷(64-9×5)32. (6.8-6.
8×0.55)÷8.533.
0.12× 4.8÷0.
12×4.834.(3.
2×1.5+2.5)÷1.
6 (2)3.2×(1.5+2.
5)÷1.635. 5.
38+7.85-5.3736.
7.2÷0.8-1.
2×537. 6.5×(4.
8-1.2×4)38. 10.
15-10.75×0.4-5.
739. 5.8×(3.
87-0.13)+4.2×3.
7440. 32.52-(6+9.
728÷3.2)×2.541.
(136+64)×(65-345÷23)42. 420+580-64×21÷2843.(58+370)÷(64-45)44.
6-1.19×3-0.4345.
0.68×1.9+0.
32×1.9
下面各題怎樣算簡便就怎樣算。
6.9+4.8+3.1 0.456+6.22+3.78 15.89+(6.75-5.89)
4.02+5.4+0.98 5.17-1.8-3.2 13.75-(3.75+6.48)
3.68+7.56-2.68 7.85+2.34-0.85+4.66 35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1 9.6+4.8-3.6 7.14-0.53-2.47
5.27+2.86-0.
66+1.63 13.35-4.
68+2.65 73.8-1.
64-13.8-5.36
47.8-7.45+8.
8 0.398+0.36+3.
64 15.75+3.59-0.
59+14.25
66.86-8.66-1.34 0.25×16.2×4 (1.25-0.125)×8
3.6×102 3.72×3.5+6.28×3.5 36.8-3.9-6.1
15.6×13.1-15.6-15.6×2.1 4.8×7.8+78×0.52 32+4.9-0.9
4.8×100.1 56.5×9.9+56.5 7.09×10.8-0.8×7.09
25.48-(9.4-0.52) 4.2÷3.5 320÷1.25÷8
18.76×9.9+18.76 3.52÷2.5÷0.4 3.9-4.1+6.1-5.9
5.6÷3.5 9.6÷0.8÷0.4 4.2×99+4.2
17.8÷(1.78×4) 0.49÷1.4 1.25×2.5×32 3.65×10.1
15.2÷0.25÷4 0.89×100.1 146.5-(23+46.5)
3.83×4.56+3.83×5.44 4.36×12.5×8 9.7×99+9.7
27.5×3.7-7.
5×3.7 8.54÷2.
5÷0.4 0.65×101 3.
2×0.25×12.5
(45.9-32.7)÷8÷0.
125 3.14×0.68+31.
4×0.032 5.6÷1.
25÷0.8÷2.5÷0.
47.2×0.2+2.4×1.4 8.9×1.01 7.74×(2.8-1.3)+1.5×2.26
3.9×2.7+3.9×7.3 18-1.8÷0.125÷0.8 12.7×9.9+1.27
21×(9.3-3.7)-5.6 15.02-6.8-1.02 5.4×11-5.4
2.3×16+2.3×23+2.3 9.43-(6.28-1.57) 3.65×4.7-36.5×0.37
46×57+23×86 13.7×0.25-3.7÷4 2.22×9.9+6.66×6.7
101×0.87-0.91×87 10.7×16.1-15.1×10.7 0.79×199
4.8+8.63+5.2+0.37 5.93+0.19+2.81 1.76+0.195+3.24
2.35+1.713+0.287+7.65 1.57+0.245+7.43 6.02+3.6+1.98
0.134+2.66+0.866 1.27+3.9+0.73+16.1 7.5+4.9-6.5
3.07-0.38-1.62 1.29+3.7+2.71+6.3 8-2.45-1.55
3.25+1.79-0.59+1.75 23.4-0.8-13.4-7.2 0.32×403
3.2+0.36+4.8+1.64 1.23+3.4-0.23+6.6 0.25×36
12.7-(3.7+0.84) 36.54-1.76-4.54 0.25×0.73×4
7.6×0.8+0.2×7.6 0.85×199 0.25×8.5×4
1.28×8.6+0.72×8.6 12.5×0.96×0.8 10.4-9.6×0.35
0.8×(4.3×1.25) 3.12+3.12×99 28.6×101-28.6
0.86×15.7-0.86×14.7 2.4×102 2.31×1.2×0.5
14-7.32-2.68 2.64+8.67+7.36+11.33 70÷28
(2.5-0.25)×0.4 9.16×1.5-0.5×9.16 3.6-3.6×0.5
63.4÷2.5÷0.4 4.9÷1.4 3.9÷(1.3×5)
(7.7+1.54)÷0.7 2.5×2.4 2.7÷45 15÷(0.15×0.4)
0.35×1.25×2×0.8 32.4×0.9+0.1×32.4 15÷0.25
4.5÷1.8 4.2÷3.5 930÷0.6÷5
數學題 速度速度速度,數學題 速度速度速度
設整個工作是x,那麼甲每天能完成x 9,乙是每天能完成x 15,再設甲離開a天,可以列式子為 x 9 6 a x 15 6 x 式子左右可以把x約掉,形成式子 1 9 6 a 1 15 6 1 然後就運用小學得方程知識可以解得 a 3 5也就是0.6天 由題知甲的效率為1 9 乙的效率為1 15設甲...
數學題速度,要過程,數學題速度,要過程
1 a b c 2 a 2 b 2 c 2 2 ab bc ca 0 1 2 ab bc ca 0 ab bc ca 1 2 2 a 2 b 2 c 2 1 a 2 b 2 c 2 2 1 即 a 4 b 4 c 4 2 a 2b 2 b 2c 2 c 2a 2 1 再求 a 2b 2 b 2c 2...
數學題速度
1 2 ab bc ac ab ac ab bc bc ac a b c b a c c a b a a b b c c 1所以 ab bc ac 1 2 2 因為 ab bc ca a b b c c a 2ab c 2a bc 2abc 所以a b b c c a ab bc ca 2ab c ...