用你喜欢的方法计算下面各题.2.05÷0.82+33.6 &...
用你喜欢的方法计算下面各题.2.05÷0.82+33.65.5×13.3+6.7×5.57.2÷0.18+20.8×3.628.4×99+28.41.5×105(4.5-...
用你喜欢的方法计算下面各题.2.05÷0.82+33.6 5.5×13.3+6.7×5.5 7.2÷0.18+20.8×3.6 28.4×99+28.4 1.5×105 (4.5-2.7)×(1.45+0.8)
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(1)2.05÷0.82+33.6
=2.5+33.6
=36.1;
(2)5.5×13.3+6.7×5.5
=5.5×(13.3+6.7)
=5.5×20
=110;
(3)7.2÷0.18+20.8×3.6
=40+74.88
=114.88;
(4)28.4×99+28.4
=28.4×(99+1)
=28.4×100
=2840;
(5)1.5×105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5;
(6)(4.5-2.7)×(1.45+0.8)
=1.8×2.25
=4.05.
=2.5+33.6
=36.1;
(2)5.5×13.3+6.7×5.5
=5.5×(13.3+6.7)
=5.5×20
=110;
(3)7.2÷0.18+20.8×3.6
=40+74.88
=114.88;
(4)28.4×99+28.4
=28.4×(99+1)
=28.4×100
=2840;
(5)1.5×105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5;
(6)(4.5-2.7)×(1.45+0.8)
=1.8×2.25
=4.05.
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