1樓:馬汝彰
(1)8.5+1.5×2+1÷0.4
=8.5+3+2.5
=(8.5+2.5)+3
=11+3
=14(2)6.9×3.6-4.84÷0.4=24.84-12.1
=12.74
(3)4.75+8.4÷(9.2-6.8)=4.75+8.4÷2.4
=4.75+3.5
=8.25
(4)1.25×64
=(1.25×8)×8
=10×8
=80(5)1.9×2.34+1.9×7.66=1.9×(2.34+7.66)
=1.9×10=19
脫式計算.(能用簡便方法的就用簡便方法計算)[8.5-(3.6+3.6)]÷2.6 10.1×8...
2樓:清風
(1)[8.5-(3.6+3.6)]÷
du2.6
=[8.5-7.2]÷2.6
=1.3÷2.6
=0.5;
(2)10.1×
zhi87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7;
(3)1.4×[(7.5+38.4)÷dao0.9]=1.4×[45.9÷0.9]
=1.4×51
=71.4.
脫式計算(能簡便的要簡便計算) 4.5×5.2+4.5×4.8 8.8×1.25 0.4×(4.3×2.5) 60.8-1.7
3樓:手機使用者
(1)4.5×
5.2+4.5×4.8
=4.5×(5.2+4.8)
=4.5×10
=45;
(2)8.8×1.25
=(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11;
(3)0.4×(4.3×2.5)
=4.3×(0.4×2.5)
=4.3×1
=4.3;
(4)60.8-1.75-1.25
=60.8-(1.75+1.25)
=60.8-3
=57.8;
(5)0.4×(4.3×2.5)
=4.3×(0.4×2.5)
=4.3×1
=4.3;
(6)45×10.1
=45×(10+0.1)
=45×10+45×0.1
=450+4.5
=454.5;
(7)0.63+0.42+0.37+9.58=(0.63+0.37)+(0.42+9.58)=1+10
=11;
(8)8.36×99+8.36
=8.36×(99+1)
=8.36×100
=836;
(9)0.78×99
=0.78×(100-1)
=0.78×100-0.78×1
=78-0.78
=77.22;
(10)90÷(3.6-1.8)
=90÷1.8
=50;
(11)36÷[(6.1-4.6)×0.8]=36÷[1.5×0.8]
=36÷1.2
=30;
(12)1.6×(2.25+10.5÷1.5)=1.6×(2.25+7)
=1.6×9.25
=14.8;
(13)12.75÷[14.6-(1.3+8.2)]=12.75÷[14.6-9.5]
=12.75÷5.1
=2.5;
(14)3.2+3.91÷(19-16.7)=3.2+3.91÷2.3
=3.2+1.7
=4.9.
脫式計算(能簡算的用簡便演算法).(1)[9.2+0.8×(9-7.75)]÷0.4; (2)3.5×9.8+0.35×2;(3)
4樓:寧負迅昭
(1)[9.2+0.8×(
9-7.75)]÷0.4
=[9.2+0.8×1.25]÷4
=[9.2+1]÷4
=2.55
(2)3.5×9.8+0.35×2
=3.5×(9.8+0.2)
=3.5×10
=35(3)28×26
27=(27+1)×
2627
=27×26
27+26
27=26+26
27=2626
27(4)[(23-3
5)×154+2
3]÷11
12=[1
15×154+2
3]÷11
12=[14+2
3]÷11
12=11
12×12
11=1
用遞等式的格式計算(能簡算的可以用簡便方法計算)7.2÷1.8+6.8×0.53.7+6.3÷0.6-0.43.5÷〔(0.45-0.3
5樓:百度使用者
(1)7.2÷1.8+6.8×0.5,
=4+3.4,
=7.4;
(2)3.7+6.3÷0.6-0.4,
=3.7+10.5-0.4,
=14.2-0.4,
=13.8;
(3)3.5÷[(0.45-0.38)×0.1],=3.5÷(0.07×0.1),
=3.5÷0.007,
=500;
(4)5.6×7.2+4.4×7.2,
=(5.6+4.4)×7.2,
=10×7.2,
=72.
脫式計算能簡算的要簡算。80.614÷25.6+4.75。用簡便計算。
6樓:歡歡喜喜
本題沒bai有簡便的計算方法。
du脫式計算是一個數學學科術zhi
語,即遞等式計dao
算,把計算過程回完整寫出來的運算,也答就是脫離豎式的計算。
80.614÷25.6+4.75
=3.148984375+4.75
=7.898984375。
3.6÷0.4-1.2x5脫式計算簡便方法
7樓:小小芝麻大大夢
3.6÷0.4-1.2×5=3。
簡便計算過程如下:
3.6÷0.4-1.2×5
=1.2×3÷0.4-1.2×5
=1.2×(3÷0.4-5)
=1.2×(7.5-5)
=1.2×2.5
=3×0.4×2.5
=3×1
=3擴充套件資料:乘法:1)乘法交換律:a*b=b*a
2)乘法結合律:a*b*c=(a*b)*c=a*(b*c)3)乘法分配律:(a+b)*c=a*c+b*c;(a-b)*c=a*c-b*c
除法:1)商不變的性質即被除數與除數同乘以或同除以一個數(零除外),商不變。
a/b=(a*n)/(b*n)=(a/n)/(b/n)2)兩個數的和(差)除以一個數,可以用這個數分別去除這兩個數(在都能整除的情況下),再求兩個商的和(差)。
(a+b)/c=a/c+b/c;(a-b)/c=a/c-b/c
8樓:凌月霜丶
3.6÷0.4-1.2x5脫式計算簡便方法3.6÷0.4-1.2x5
=9-6
=3直接計算
-、脫式計算。(能簡便的簡便) (1)3.6×5÷3.6×5 二、解決問題。 (1)一間教室的面積 20
9樓:匿名使用者
(1)3.6×5÷3.6×5=25
87.04÷0.4²=544
9÷4.5=2小時 4.5÷9=0.5公頃18-21.6×18÷24.3=2
3.5×(0.32÷0.4)=2.8
(8.1+4.5)÷(7.52-1.5)=
10樓:匿名使用者
6.25÷1%-1.25×25×8
=625-(1.25×8)×25
=625-10×25
=625-250
=375
3/5×81+60%×19
=0.6×(81+19)
=0.6×100
=604/3×4÷4×4/3
=4/3×4/3×(4÷4)
=4/3×4/3
=16/9
13/7×12.5%+12.5%×13/6=(13/7+13/6)×12.5%
=1×12.5%
=0.125
5/4×3.5+5.5×80%+0.8
=0.8×(3.5+5.5+1)
=0.8×10
=8(27+19/18)÷9
=27÷9+19/18÷9
=3+19/2
=3又19/2
81/5×3.6÷1又6/1
=9/2÷7/6
=9/2×6/7
=27/7
11樓:建小之
25沒有長寬尺寸怎麼算
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