0.25×4.78 3.4×9＋3.4 2.7×4.3＋2.7×5.7 1.25×11×0.8 4.6×102 用简便方法计算的,0.25×4.78×4
问题描述：
0.25×4.78 3.4×9＋3.4 2.7×4.3＋2.7×5.7 1.25×11×0.8 4.6×102 用简便方法计算的,
0.25×4.78×4
答
0.25×4.78=0.25×（4+0.78）=0.25×4+0.25×0.78=1+0.195=1.1953.4×9＋3.4=3.4×（9+1)=3.4×10=342.7×4.3＋2.7×5.7=2.7×（4.3+5.7）=2.7×10=271.25×11×0.8=1.25×0.8×11=1×11=114.6×102 =4.6×（100+2）...