题目内容
【题目】下列各题怎样简便怎样算.
4.5×10.1 13÷0.4÷2.5
28.4×99+28.4 0.125×3.2×0.25
【答案】(1)45.45
(2)13
(3)2840
(4)0.1
【解析】
(1)4.5×10.1
=4.5×(10+0.1)
=4.5×10+4.5×0.1
=45+0.45
=45.45
(2)13÷0.4÷2.5
=13÷(0.4×2.5)
=13÷1
=13
(3)28.4×99+28.4
=28.4×(99+1)
=28.4×100
=2840
(4)0.125×3.2×0.25
=0.125×(8×0.4)×0.25
=(0.125×8)×(0.4×0.25)
=1×0.1
=0.1

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