摘要:400-210= 490+160= 28万+36万= 730+180= 139+71= 720÷40= 50×70= 620-160= 820-70= 418-196= 299+398= 230万-90万=2.求未知数. x+38=101 x-235=235 425+x=1600 1100-x=748
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