五年级上册数学 小数乘除法的简便计算

五年级上册数学 小数乘除法的简便计算


简介:
(1)4.5×13.6+55×1.36 =45×1.36+55×1.36 =(45+55)×1.36 =100×1.36 =136 (2)0.34×101 =0.34×(100+1) =0.34×100+0.34 =34+0.34 =34.34 (3)0.5×7.6×20 =(0.5×20)×7.6 =10×7.6 =76 (4)90.5×99+90.5 =90.5×(99+1) =90.5×100 =9050