试题与答案

用简便方法计算。(1)88×0.25×4(2)2.8×7.2+2.8×2.8(3

题型:计算题

题目:

用简便方法计算。
(1)88×0.25×4(2)2.8×7.2+2.8×2.8
(3)10.1×55(4)25.74-0.51-4.49

答案:

(1)88×0.25×4

 =88×1

 =88(2)2.8×7.2+2.8×2.8

 =2.8×(7.2+2.8)

 =28

(3)10.1×55

 =550+5.5

 =555.5(4)25.74-0.51-4.49

 =25.74-5

 =20.74

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