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168÷4+20x4用脱式计算怎么计算?

168÷4+20×4 =42+80 =112

7.20.25+2.8x4脱式计算怎么做 7.20.25+2.8x4 =7.2*4+2.8*4 =4*(7.2+2.8) =4*10 =40

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