问题
解答题
解方程,我没问题!
χ+20%χ=24 8(x-2)=2(x+7) |
答案
(1)
:3 5
=7 12
:x,9 10
x=3 5
×7 12
,9 10
x×3 5
=5 3
×21 40
,5 3
x=
;7 8
(2)x+20%x=24,
1.2x=24,
1.2x÷1.2=24÷1.2,
x=20;
(3)8(x-2)=2(x+7),
8x-16=2x+14,
8x-16-2x=2x+14-2x,
6x-16+16=14+16,
6x÷6=30÷6,
x=5.