问题
解答题
解方程
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答案
①0.9X=2.7,
0.9X÷0.9=2.7÷0.9,
X=3;
②X-12.56=7.8,
X-12.56+12.56=7.8+12.56,
X=20.36;
③X÷3.5=7,
X÷3.5×3.5=7×3.5,
X=24.5;
④1.25+X=4,
1.25+X-1.25=4-1.25,
X=2.75.
解方程
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①0.9X=2.7,
0.9X÷0.9=2.7÷0.9,
X=3;
②X-12.56=7.8,
X-12.56+12.56=7.8+12.56,
X=20.36;
③X÷3.5=7,
X÷3.5×3.5=7×3.5,
X=24.5;
④1.25+X=4,
1.25+X-1.25=4-1.25,
X=2.75.