解方程. 3X+7X+2.6=74
解方程.3X+7X+2.6=742X+3X=50X-0.85X=4.2....
解方程. 3X+7X+2.6=74 2X+3X=50 X-0.85X=4.2.
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拓跋洽k4
2014-12-28
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(1)3X+7X+2.6=74, 10x+2.6-2.6=74-2.6, 10x=71.4, 10x÷10=71.4÷10, x=7.14;
(2)2X+3X=50, 5x=50, 5x÷5=50÷5, x=10;
(3)X-0.85X=4.2, 0.15x=4.2, 0.15x÷0.15=4.2÷0.15, x=28. |
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