题目内容
【题目】脱式计算:
÷× | ×99 | 0.125×2.5×32 |
÷÷ | (﹣1)× | ×17﹣ |
【答案】(1)÷×
=×
=;
(2)×99
=×(98+1)
=×98+×1
=23+
=23;
(3)0.125×2.5×32
=0.125×2.5×(4×8)
=(0.125×8)×(2.5×4)
=1×10
=10;
(4)÷÷
=÷
=;
(5)(﹣1)×
=×﹣1×
=1﹣
=;
(6)×17﹣
=×(17﹣1)
=×16
=15.
【解析】解:(1)÷×
=×
=;
(2)×99
=×(98+1)
=×98+×1
=23+
=23;
(3)0.125×2.5×32
=0.125×2.5×(4×8)
=(0.125×8)×(2.5×4)
=1×10
=10;
(4)÷÷
=÷
=;
(5)(﹣1)×
=×﹣1×
=1﹣
=;
(6)×17﹣
=×(17﹣1)
=×16
=15.
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