解方程 x/8=0.240.6 1.24×4-7x=3/5 x-30%x=50%x+12.
问题描述:
解方程
=x 8
0.24 0.6
1.24×4-7x=
3 5
x-30%x=50%x+12.
答
(1)
=x 8
,0.24 0.6
0.6x=8×0.24,
0.6x÷0.6=1.92÷0.6,
x=3.2;
(2)1.24×4-7x=
,3 5
4.96-7x=
,3 5
4.96-7x+7x=
+7x,3 5
+7x=4.96,3 5
+7x-3 5
=4.96-3 5
,3 5
7x÷7=4.36÷7,
x=
;109 175
(3)x-30%x=50%x+12,
x-30%x-50%x=50%x+12-50%,
0.2x=12,
0.2x÷0.2=12÷0.2,
x=60.