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2.4x42x5简便运算算式

2.5*48*5简便计算解:原式=2.5*(8*6)x5=(2.5*8)*(6*5)=20*30=600分析:运用乘法交换律计算.

= (2+0.4)*2.5=2*2.5+0.4*2.5=5+1=6

2.4x2.5x3.7=2.4x(5÷2)x(3+0.7)=2.4*5÷2*(3+0.7)=12÷2*(3+0.7)=6*3+6*0.7=18+4.2=22.2

2.4x1.2x0.5=2.88*0.5=1.44

2.4x1.2x0.5=2.4x(1.2x0.5)=2.4x0.6=1.44

85X5/42 =(84+1)*5/42=84*5/42+1*/5/42=10+5/42=10又5/42

2.4x0.5x0.4x5=2.4x0.5x(0.4x5)=2.4x(0.5x2)=2.4x1=2.4

你好!24*36*5=24*5*36=120*36=4320 仅代表个人观点,不喜勿喷,谢谢.

4.5*5.5=(5-0.5)*(5+0.5)=5*5-0.5*0.5=25-0.25=24.75

解,2.4x7.5 =0.4x6x(2.5x3) =0.4x2.5x6x3 =1x18 =18

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