原方程可化為:1.5x×0.9+1.4(500-x)×0.9-500=157
去括號(hào)得:1.5x×0.9+700×0.9-1.4x×0.9-500=157
即有:0.1x×0.9+630-500=157
0.09x+130=157
移項(xiàng)得:0.09x=27
9x=2700
解得:x=300
(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=157 用去括號(hào)、移項(xiàng)、合并同類項(xiàng)、系數(shù)化為1的步驟來(lái)做
(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=157 用去括號(hào)、移項(xiàng)、合并同類項(xiàng)、系數(shù)化為1的步驟來(lái)做
數(shù)學(xué)人氣:782 ℃時(shí)間:2020-05-12 00:41:27
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