1.25x2.5x0.8x2.5的简便计算=(1.25x0.8)x(2.5x2.5)=1x6.25=6.25
1.25x2.5x0.8x2.5=(1.25x0.8)x(2.5x2.5)=1x6.25=6.25
(1.25×0.8)×2.5×2.5,感觉这题中间是+号