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12.5×4.8的简便运算.

12.5x4.8 =12.5x8x0.6 =100x0.6 =60

2.1乘12.5乘4.8,该怎么简便运算的

4.8×12.5 =0.6×(8×12.5) =0.6×100 =60

4.8×10.8×12.5 =(0.6×10.8)×(8×12.5) =6.48×100 =648

解: 1.78×12.5-8 =1.78x12.5-12.5x0.64 =12.5x(1.78-0.64) =12.5x1.14 =12.5x1+12.5x0.1+12.5x0.04 =12.5+1.25+0.5 =13.75+0.5 =14.25

8.08×12.5 =(8+0.08)×12.5 =8×12.5+0.08×12.5 =100+1 =101

12.5x8=12.5x(10-2)=125-25=100 看错了,是8.8 12.5x8.8=12.5x(8+0.8)=100+10=110 125*8=1000;25x4=100这些特别式子需要记住,不然所谓的简便计算是不算简便的。

12.5x103 =12.5x(100+3) =12.5x100+12.5×3 =1250+37.5 =1287.5

12.5×3.2 =25×0.5×0.4×8 =25×8×0.5×0.4 =200×0.2 =40

分析此题考查的学生对乘法分配律以及简单口算能力的运用12.5*(0.8+2)=12.5*0.8+12.5*2=10+25=35

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