问题
解答题
解方程,我没问题! X+3X=
|
答案
(1)X+3X=
,2 5
4X=
,2 5
4X×
=1 4
×2 5
,1 4
X=
;1 10
(2)4x-1.6x=36,
(4-1.6)x=36,
2.4x=36,
2.4x÷2.4=36÷2.4,
x=15;
(3)60%x=4.2,
0.6x=4.2,
0.6x÷0.6=4.2÷0.6,
x=7.
解方程,我没问题! X+3X=
|
(1)X+3X=
,2 5
4X=
,2 5
4X×
=1 4
×2 5
,1 4
X=
;1 10
(2)4x-1.6x=36,
(4-1.6)x=36,
2.4x=36,
2.4x÷2.4=36÷2.4,
x=15;
(3)60%x=4.2,
0.6x=4.2,
0.6x÷0.6=4.2÷0.6,
x=7.