(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=157 用去括号、移项、合并同类项、系数化为1的步骤来做
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(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=157用去括号、移项、合并同类项、系数化为1的步骤来做(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=1
(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=157 用去括号、移项、合并同类项、系数化为1的步骤来做
(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=157 用去括号、移项、合并同类项、系数化为1的步骤来做
(1+50%)x×0.9+(1+40%)(500-x)×0.9-500=157 用去括号、移项、合并同类项、系数化为1的步骤来做
原方程可化为:1.5x×0.9+1.4(500-x)×0.9-500=157
去括号得: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
移项得:0.09x=27
9x=2700
解得:x=300
x+60%x=80 80%-30x=305 35%x=210 x+50%x=60 x-40%x=0x+60%x=8080%-30x=30535%x=210x+50%x=60x-40%x=0.36(1-80%)x=21么么哒!
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解方程 40%x=12 (1+60%)x=24 (1-37.5%)x=10 2x+50%x=20 40%x+30%x=140 35%x-15%x=72
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