题目内容
【题目】解方程
(1)x:42=
,
(2)
×0.5+
x=
,
(3)0.8:
=0.48:x,
(4)χ﹣
χ=
,
(5)42:
=χ:![]()
(6)5x﹣0.4=75%,
【答案】3 6
3 50 0.23
【解析】
(1)x:42=
,
解:10x=42×
,
10x÷10=30÷10,
x=3
(2)
×0.5+
x=
,
解:0.75+
x=3.75,
0.75+
x﹣0.75=3.75﹣0.75,
x=3,
x÷
=3÷
,
x=6;
(3)0.8:
=0.48:x,
解:0.8x=
×0.48,
0.8x=0.2,
0.8x÷0.8=0.2÷0.8,
x=![]()
(4)χ﹣
χ=
,
解:
x=
,
x
=![]()
,
x=3;
(5)42:
=χ:![]()
解:
x=42×
,
x
=30
,
x=50;
(6)5x﹣0.4=75%,
解:5x﹣0.4+0.4=75%+0.4,
5x÷5=1.15÷5,
x=0.23
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