阿摩線上測驗
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詳解 (共 1 筆)
詳解
(x+3y) / 5-(x-y) / 2
= 2(x+3y) / 10-5(x-y) / 10
= (2x+6y- 5x+5y) / 10
= (2x- 5x+6y5y) / 10
= (- 3x+11y) / 10
= 2(x+3y) / 10-5(x-y) / 10
= (2x+6y- 5x+5y) / 10
= (2x- 5x+6y5y) / 10
= (- 3x+11y) / 10