整数乘法运算定律推广到小数1.在得数相同的算式后面画“√”,不同的画“✕”。(1)(2.8+1.6)×1.72.8×1.7+1.6×1.7 ( ) (2)7.4×(2+0.1)7.4×2+0.1 ( )2.用简便方法计算下面各题。0.25×8.645×4 9.76×0.73-0.76×0.73 8.7×201,答案提示1.(1)√(2)✕ 2. 0.25×8.645×4 =0.25×4×8.645=1×8.645=8.6459.76×0.73-0.76×0.73=(9.76-0.76)×0.73=9×0.73=6.57 8.7×201=8.7×(200+1)=8.7×200+8.7=1748.7
