问题
解答题
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答案
(1)x-7.2=10,
x-7.2+7.2=10+7.2,
x=17.2;
(2)9x=4.5,
9x÷9=4.5÷9,
x=0.5;
(3)x÷60=12,
x÷60×60=12×60,
x=720;
(4)47+x=47,
47+x-47=47-47,
x=0.
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(1)x-7.2=10,
x-7.2+7.2=10+7.2,
x=17.2;
(2)9x=4.5,
9x÷9=4.5÷9,
x=0.5;
(3)x÷60=12,
x÷60×60=12×60,
x=720;
(4)47+x=47,
47+x-47=47-47,
x=0.