问题
解答题
解方程.
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答案
(1)
=1.2 7.5
,0.4 x
1.2x=7.5×0.4,
1.2x=3,
1.2x÷1.2=3÷1.2,
x=2.5;
(2)3x-0.8×75%=2.1,
3x-0.6+0.6=2.1+0.6,
3x=2.7,
3x÷3=2.7÷3,
x=0.9;
(3)3.2×37.5%+5.3×0.375+1.5×
,3 8
=(3.2+5.3+1.5)×0.375,
=10×0.375,
=3.75.