12.5*0.4*2.5*8简便计算

12.5x0.4x2.5x8; =12.5x8x0.4x2.5; =100x1; =100

12.5*0.4*2.5*8简便运算

(0.4+0.8)*2.5*12.5 =0.4*2.5*12.5+0.8*12.5*2.5=12.5+25 =37.5.

12.5*0.4*2.5*8怎么简便计算?

=100

2.5*(8-0.4)*12.5简算

原式=12.5*2.5*8+12.5*2.5*0.4 =(12.5*8)*2.5+12.5*(2.5*0.4) =100*2.5+12.5*1 =250+12.5 =262.5

用简便方法计算.(1)12.5*0.4*2.5*8(2)9.5*101(3)4..

(1)=8/49 /(1+3/7)=4/35 (2)=9-5=4 (3)=1.3+9.7-(3.79+6.21)=11-10=1 (4)=8*12.5*0.4*2.5=100*1=100

12.5*0.4*2.5*8的简便运算

12.5*0.4*2.5*8= (12.5*8)*(0.4*2.5)=100*1=100

用简便方法计算12.5x0.4x2.5x89.5x101=

用简便方法计算12.5x0.4x2.5x89.5x101==0.4x2.5x12.5x89.5x101=1x12.5x(80+9.5)x101=(1000+125-6.25)x101=101000+12625-631.25=113625-631.25=112993.75

怎么简便运算12.5*10.8= 0.69*102= 12.5*3.2*2.5= 8.8*1.25=

12.5*10.8= 12.5*(10+0.8) 0.69*102= 0.69*(100+2)=0.69*100+(0.7-0.01)*2=69+0.7*2-0.01*2 12.5*3.2*2.5=12.5*8*0.4*2.58.8*1.25=(8+0.8)*1.25=8*1.25+0.8*1.25

12.5*0.4*2.5*8的简便计算.

12.5x0.4x2.5x8=(12.5x8)x(2.5x0.4)=100x1=100

12.5*(8*0.4)简便计算

12.5*(8*0.4)=12.5x8x0.4=100x0.4=40