Question

六年级方程解答

1.解方程(请写出过程)
X-7/9X=5/12
X+3/4X=140
3/5X+20=50

2.(照样请写出过程,可以不用简便)
(1/4-1/8)÷5/12
2/5×(1/2+1/3)÷4/9
[17/12-(3/4_1/6)]÷3/4
9/13÷27/26-4/9

Answer 1

1.
x-7/9x=5/12
解: x=5/12除7/9
x+3/4x=140
解： x=140除7/4
3/5x+20=50
解：3/5=30
x=30除3/5

Answer 2

反抗一下二楼的，人家六年级，你呢？？
（1）X-7/9X=5/12
（1-7/9）x=5/12
(2/9)x=5/12
x=15/8
(2)X+3/4X=140
(1+3/4)x=140
(7/4)x=140
x=80
(3)3/5X+20=50
3/5x=-30
x=-50
(1)(1/4-1/8)÷5/12
=(2/8-1/8)÷5/12
=1/8÷5/12
=3/10
(2)2/5×(1/2+1/3)÷4/9
=2/5×5/6÷4/9
=1/3÷4/9
=3/4
(3)[17/12-(3/4_1/6)]÷3/4
=[17/12-7/12]÷3/4
=0
(4)9/13÷27/26-4/9
=2/3-4/9
=2/9