求未知数X.1717+X=2809X×72=729660÷X=420
求未知数X.1717+X=2809X×72=729660÷X=420....
求未知数X.1717+X=2809X×72=729660÷X=420.
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2014-08-12
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(1)1717+X=2809, 1717+X-1717=2809-1717, x=1092;
(2)X×72=72, X×72÷72=72÷72, x=1;
(3)9660÷X=420, 9660÷X×x=420×x, 9660÷420=420x÷420, x=23. |
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