题目内容

选择合适的方法计算。
(1)22.5×(7.8+8.2) (2)13.8-0.416-2.584 (3)1.25×0.25×3.2
(4)71.8×0.9+7.18 (5)7.3×2.4-14×0.73
(1)22.5×(7.8+8.2)
  =22.5×16
  =360
(2)13.8-0.416-2.584
  =13.8-(0.416+2.584)
  =10.8
(3)1.25×0.25×3.2
  =1.25×8×(0.4×0.25)
  =1
(4)71.8×0.9+7.18
  =71.8×(0.9+0.1)
  =71.8
(5)7.3×2.4-14×0.73
  =7.3×(2.4-1.4)
  =7.3
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