问题
解答题
解方程:
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答案
(1)4.9+0.5x=5.6,
4.9+0.5x-4.9=5.6-4.9,
0.5x÷0.5=0.7÷0.5,
x=1.4;
(2)1-75%x=0.75,
1-75%x+75%=0.75+75%x,
1-0.75=0.75+75%x-0.75,
0.25÷75%=75%x÷75%,
x=
;1 3
(3)
=x:4 0.6
,9 10
0.6x=4×
,9 10
0.6x÷0.6=
÷0.6,18 5
x=6.