计算,能简便的用简便方法算.45÷57÷78-13.47-8÷17-317×32.8×14+7.2÷41320×17+3÷201379100×101(518÷13+518)×0.25
计算,能简便的用简便方法算. 45÷÷-1 | 3.47-8÷17-×3 | 2.8×+7.2÷4 |
×17+3÷ | ×101 | (÷+)×0.25 |
答案和解析
(1)45÷
÷-1
=45××-1
=72-1
=71;
(2)3.47-8÷17-×3
=3.47-(+)
=3.47-1
=2.47;
(3)2.8×+7.2÷4
=2.8×+7.2×
=(7.2+2.8)×
=10×
=;
(4)×17+3÷
=×17+3×
=(17+3)×
=20×
=13;
(5)×101
=×100+×1
=79+
=79;
(6)(÷+)×0.25
=(×3+)×0.25
=×4×0.25
=.
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