解方程:X÷0.8=1.25;
解方程:X÷0.8=1.25;3X-1.2X=9;5(X-6)=12;7X-2×9=80....
解方程:X÷0.8=1.25; 3X-1.2X=9; 5(X-6)=12; 7X-2×9=80.
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(1)X÷0.8=1.25, X÷0.8×0.8=1.25×0.8, X=1; (2)3X-1.2X=9, (3-1.2)X=9, 1.8X=9, 1.8X÷1.8=9÷1.8, X=5; (3)5(X-6)=12, 5X-30=12, 5X-30+30=12+30, 5X=42, 5X÷5=42÷5, X=8.4; (4)7X-2×9=80, 7X-18=80, 7X-18+18=80+18, 7X=98, 7X÷7=98÷7, X=14. |
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