问题
解答题
解方程. 2.1×(X-0.26)=0.273
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答案
(1)2.1×(X-0.26)=0.273,
2.1×(X-0.26)÷2.1=0.273÷2.1,
X-0.26=0.13,
X-0.26+0.26=0.13+0.26,
X=0.39;
(2)
X-2 5
X=3 8
,3 25
X=1 40
,3 25
X÷1 40
=1 40
÷3 25
,1 40
X=
.24 5