问题
解答题
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答案
①X÷2.4=4,
X÷2.4×2.4=4×2.4,
X=9.6;
②210+X=640,
210+X-210=640-210,
X=430;
③0.7X=0.56,
0.7X÷0.7=0.56÷0.7,
X=0.8;
④x-1.2=0.6,
x-1.2++1.2=0.6+1.2,
x=1.8.
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①X÷2.4=4,
X÷2.4×2.4=4×2.4,
X=9.6;
②210+X=640,
210+X-210=640-210,
X=430;
③0.7X=0.56,
0.7X÷0.7=0.56÷0.7,
X=0.8;
④x-1.2=0.6,
x-1.2++1.2=0.6+1.2,
x=1.8.