问题
解答题
解方程. 3.2X-5×3=72 8(X-2)=
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答案
(1)3.2X-5×3=72,
3.2X-15=72,
3.2X-15+15=72+15,
3.2X=87,
3.2X÷3.2=87÷3.2,
X=27.1875;
(2)8(X-2)=
(X+7),1 2
8X-16=
X+1 2
,7 2
8X-16+16=0.5X+3.5+16,
8X=0.5X+19.5,
8X-0.5X=0.5X+19.5-0.5X,
7.5X=19.5,
7.5X÷7.5=19.5÷7.5,
X=2.6.