问题
解答题
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答案
①7.8×3x=3.6
7.8÷3.6×3x=3.6÷3.6
6x=1
6x÷6=1÷6
x=1 6
②x÷1.98=0.4
x×1.98÷1.98=0.4×1.98
x=0.792
③（4.5-x）×0.375=0.75
4.5×
-3 8
x=3 8 3 4
-13.5 8
x=3 8 6 8
x=3 8 7.5 8
x×3 8
=8 3
×7.5 8 8 3
x=2.5
④12 x+23 x=14
35x=14
35x÷35=14÷35
x=2 5
⑤x-0.52x=3.2×0.15
0.48x=0.48
0.48x÷0.48=0.48÷0.48
x=1
⑥12x+25%=10
12x+0.25=10
12x+0.25-0.25=10-0.25
12x=9.75
12x÷12=9.75÷12
x=0.8125