200x+50×(22-x)=1400= ====10x-5×3=840= =====第二题抄错了,因该是:10x-5×(10-x)=25

问题描述:

200x+50×(22-x)=1400
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10x-5×3=840
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第二题抄错了,因该是:10x-5×(10-x)=25