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78x55十55x22简便运算

78十55+55x22提取公因数55=55x(78+22)=55x100=5500

简便计算55x78十55x22乘法分配律55x78十55x22=55*(78+22)=55*100=5500

28x55十55x72=55*(28+72)=55*100=5500

78x23+23x22=78x23+22x23=(78+22)x23=100x23=2300

答:78x24十24x22 =24*(78+22) =24*100 =2400

原式=78x25+(25+30)x22=78x25+25x22+30x22=(78+22)x25+660=100x25+660=2500+660=3160

简便计算55X78十55X21十55=55x(78+21+1)=55x100=5500

55X99+55=55X(99+1)=55X100=5500

42x55十55x58=(42+58)*55=100*55=5500

45x53十55x55=45x53十55x(53+2)=45x53十55x53+55x2=(45+55)x53+55x2=100x53+110=5410

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