1樓:匿名使用者
1/4x(7+5/7)+0.25x(3+2/7)+1/4=1/4x(7+5/7+3+2/7+1)
=1/4x12=3
2樓:匿名使用者
解18-1.8x=7.2
脫式計算(3/4+1/6)*2/3 25*1/5-5*1/5 6/11*7/15*10 (1/7+1/4)*28 (21+2/5)*5/7 39*7/13*2/3
3樓:匿名使用者
(3/4+1/6)*2/3 =(9/12+2/12)x2/3=11/18
25*1/5-5*1/5 =5-1=4
6/11*7/15*10 =60/15x7/11=28/11(1/7+1/4)*28 =4+7=11
(21+2/5)*5/7 =15+2/7
39*7/13*2/3=14
60*2/5=12x2=24
4*2/9=8/9
3/10*2/3+1/4=1/5+1/4=9/2020*2/5-5/8 =8-5/8=6+3/82/9*8+2/9=2 /9x(8+1)=25/7*1/5*49 =1/7
48*1/12*5/6 =20/6=10/3
脫式計算能簡算的要簡算(1)7分之12-(7分之5+0.5)(2)[1-(0.25+8分之3)]除以4分之1
4樓:學馥刁豐
(1)12/7
-(5/7+0.5)
=(12/7-5/7)-0.5
=1-0.5
=0.5
(2)[1-(0.25+3/8)]÷1/4=[1-(2/8+3/8)]÷1/4
=(1-5/8)÷1/4
=3/8÷1/4
=3/2
(3)(0.875+1/4)(1/8-1/72)=(7/8+2/8)(9/72-1/72)=9/8
×抄8/72
=1/8
(3)(7/5-2/5)÷4/5÷(3/7+3/2×4/9)=1÷4/5÷(3/7+2/3)
=5/4÷(9/21+14/21)
=5/4÷23/21
=105/92=1又
13/92
(你題目有可能打錯了)
解方程(1)
2x+0.4x=7.2
2.4x=7.2
x=7.2÷2.4
x=3(2)
5-2/3x=1/3
2/3x=5-1/3
2/3x=14/3
x=14/3÷2/3
x=7(3)
0.8+1/2x=0.9
1/2x=0.9-0.8
1/2x=0.1
x=0.2
(4)5x-3×7/10=7/5
5x=21/10+14/10
5x=35/10
x=7/10
以後自己做,這麼小不自己算,你長大後會算什麼?
5樓:瑞彭魄卿邃
(1)12/7
-(5/7+0.5)
=(12/7-5/7)-0.5
=1-0.5
=0.5
(2)[1-(0.25+3/8)]÷
zhi1/4
=[1-(2/8+3/8)]÷1/4
=(1-5/8)÷1/4
=3/8÷1/4
=3/2
(3)(0.875+1/4)(1/8-1/72)=(7/8+2/8)(9/72-1/72)=9/8
×8/72
=1/8
(3)(7/5-2/5)÷4/5÷(3/7+3/2×4/9)=1÷4/5÷(3/7+2/3)
=5/4÷(9/21+14/21)
=5/4÷23/21
=105/92=1又
13/92
(你dao
題目有可
版能打錯了)權
解方程(1)
2x+0.4x=7.2
2.4x=7.2
x=7.2÷2.4
x=3(2)
5-2/3x=1/3
2/3x=5-1/3
2/3x=14/3
x=14/3÷2/3
x=7(3)
0.8+1/2x=0.9
1/2x=0.9-0.8
1/2x=0.1
x=0.2
(4)5x-3×7/10=7/5
5x=21/10+14/10
5x=35/10
x=7/10
4/7+1/5-3/7+5/13=? 脫式計算:4/7+1/5-3/7+4/5=? 5.2-11÷7-1/7×2=? 3/4×4÷4×3/4=?和
6樓:匿名使用者
4/7+1/5-3/7+4/5=(4/7-3/7)+(1/5+4/5)=1/7+1=8/7
5.2-11÷7-1/7×
2=26/5-11/7-2/7=26/5-(11/7+2/7)=26/5-13/7=117/35
3/4×4÷4×3/4=(3/4×4)÷(4×3/4)=3÷3=1
脫式計算:7.9×1又1/4+4.1÷4/5 5/8×(2/5+1/3)÷2/3 (1/5+4/5×1/8)÷1/5
7樓:小辣
7.9×1又1/4+4.1÷
4/5=7.9×1又1/4+4.1×5/4
=5/4×(7.9+4.1)
=5/4×12
=155/8×(2/5+1/3)÷2/3
=5/8×2/5×3/2+5/8×1/3×3/2=3/8+5/16
=11/16
(1/5+4/5×1/8)÷1/5
=1/5×5+4/5×18×5
=1+72=73
5/7+4又4/5+2/7+5.2脫式計算,要過程
8樓:葉聲紐
5/7+4又4/5+2/7+5.2脫式計算5/7+4又4/5+2/7+5.2
=(5/7)+(2/7)+4.8+5.2
=1+10
=11.
9樓:八戒你胖咯
5/7+4又4/5+2/7+5.2
=(5/7+2/7)+(4.8+5.2)
=1+10=11
10樓:匿名使用者
5/7+2/7+4.8+5.2
1+1011
遞等式計算 3/4-(2/5+3/10) 5/7+1/4-9/14 3/4+3/6-5/8 5/9
11樓:阿凡達教
4/3—(2/5+3/1o丿=4o/3o一{i2/30+9/3o)=4o/30_21/3o=丨9/30先通分再計算
脫式計算4/5×2/7+1/7÷3/4
12樓:樂為人師
=8/35+4/21
=44/105
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