1樓:嚼咬
(1)4.85+3.62+1.38+5.15,du=(zhi4.85+5.15)+(3.62+1.38),dao專=10+5,
=15;
(2)[16.7-(6.2+9.5)]×8.3,=[16.7-15.7]×8.3,
=1×8.3,
=8.3;
(3)3.25÷
屬0.25+1.75÷0.25,
=13+7,
=20;
(4)10.52-(3.52-1.7),
=10.52-3.52+1.7,
=7+1.7,
=8.7.
150*50-25*5(脫式計算。)(能簡算的要簡算)
2樓:恆新國儀科技****
運用乘法的結合運算,可以得出以下結論:
150*50-25*5
=25*6*5*10-25*5
=25*5*(6*10-1)
=125*(60-1)
=125*59
=7375
3樓:瀛洲煙雨
=7500-125
=7375
直接算最簡便
2-6/13÷9/29-2/3,用脫式計算,能簡算的要簡算。
4樓:匿名使用者
2-6/13÷9/29-2/3
解:根據約分和通分的運用,
原式=2-6/13÷9/29-2/3
=2-6/13x29/9-2/3
=2-58/39-2/3
=2-1-19/39-26/39
=1-45/39
=-6/39
=-2/13
脫式計算(能簡算的要簡算) 2.5×7.1×4 16.12×99+16.12 5.2×0.9+0.9×4.8 [113-(34.15+3
5樓:誒呀
(1)2.5×7.1×4,
=(2.5×4)×7.1,
=10×7.1,
=71;
(2)16.12×99+16.12,
=16.12×(99+1),
=16.12×100,
=1612;
(3)5.2×0.9+0.9×4.8,
=0.9×(5.2+4.8),
=0.9×10,
=9;(4)[113-(34.15+38.25)]÷2,=[113-72.4]÷2,
=40.6÷2,
=20.3;
(5)3.6÷(1.2+0.6)×0.5,=3.6÷1.8×0.5,
=2×0.5,
=1;(6)4.82÷0.25+1.25÷0.25,=4.82×4+1.25×4,
=19.28+5,
=24.28.
脫式計算能簡算的要簡算
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