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25乘75加26乘25减25的简便计算

75x25-25x25 =(75-25)x25 =50x25 =1250

75×25-25×25+50×25 =25×(70-25+50) =25×95 =25×(100-5) =25×100-25×5 =2500-125 =2375

75加25乘43减36的简便运算 75+25*43-36 =75+1075-36 =1150-36 =1114

231-25+75= 231 +(75-25)= 231+50= 281

解: 75×25+85×75+15×25 =75×25+85×75+15×(100-75) =75×25+85×75+15×100-15×75 =75×(25+85-15)+1500 =75×(100-5)+1500 =75×100-75×5+1500 =7500-375+1500 =8625 启示:做此类题,充分利用加减乘除中的交换律,结合律,分配率。

75=25*3,表示75里有3个25 所以,上式可以简化为25*97+25*3=25*(97+3)=25*100=2500

75×88+25×36 =75×88+75×12 =75×(88+12) =75×100 =7500

75乘32加25乘32 =32×(75+25) =3200

75x27+19x25 =25x3x27+19x25 =25x(81+19) =2500

64×75+65×25 =(65-1)×75+65×25 =65×75-75+65×25 =65×(75+25)-75 =65×100-75 =6500-75 =6425

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