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二点儿九乘以零点四五加上零点二九乘以四点二加上零点029乘冶十三用简便算法

2.9×0.45+0.29×4.2+0.029×13 =2.9×0.45+2.9×0.42+2.9

9.12×0.72+0.912×2.8 =9.12×0.72+9.12×0.28 =9.12×(

4.52*9.9+0.452 =4.52*9.9+4.52*0.1 =4.52(9.9+0.1)

99.99×0.8+11.11×2.8 =11.11×7.2+11.11×2.8 =11.11×

  会心一笑.   每个人,也许都会有类似的梦.我们无法丈量自己生活的长度,但我们可以拓展自己生命

9.9×0.35 =0.35×(10-0.1) =0.35×10-0.35×0.1 =3.5-

原式=0.86x1+8.6x9.9 =0.86x1+0.86x10x99 =0.86x(1+99

6.292乘0.283,保留一位小数是多少? 6.292×0.283=1.780636≈1.8

原式 =1.25x0.9x0.8 =1.25x0.8x0.9 =1x0.9 =0.9

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