问题
解答题
解方程. ①1.2x-3.8=2.2 ②x-64%x=0.9 ③
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答案
(1)1.2x-3.8=2.2,
1.2x-3.8+3.8=2.2+3.8,
1.2x÷1.2=6÷1.2,
x=5;
(2)x-64%x=0.9,
0.36x=0.9,
0.36x÷0.36=0.9÷0.36,
x=2.5;
(3)
:x=3 5
:7 8
,5 6
x=7 8
×3 5
,5 6
x×7 8
=8 7
×1 2
,8 7
x=
.4 7