用简便方法计算下面各题. 9.8×25 0.3×2.5×0.4 2.3
用简便方法计算下面各题.9.8×250.3×2.5×0.42.33×0.5×0.4×50.8×630×0.1250.13×1023.12×4+1.88×4....
用简便方法计算下面各题. 9.8×25 0.3×2.5×0.4 2.33×0.5×0.4×5 0.8×630×0.125 0.13×102 3.12×4+1.88×4.
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(1)9.8×25
=(10-0.2)×25
=10×25-0.2×25
=250-5
=245;
(2)0.3×2.5×0.4
=0.3×(2.5×0.4)
=0.3×1
=0.3;
(3)2.33×0.5×0.4×5
=2.33×(5×0.4×0.5)
=2.33×1
=2.33;
(4)0.8×630×0.125
=(0.8×0.125)×630
=0.1×630
=63;
(5)0.13×102
=0.13×100+0.13×2
=13+0.26
=13.26;
(6)3.12×4+1.88×4
=(3.12+1.88)×4
=5×4
=20.
=(10-0.2)×25
=10×25-0.2×25
=250-5
=245;
(2)0.3×2.5×0.4
=0.3×(2.5×0.4)
=0.3×1
=0.3;
(3)2.33×0.5×0.4×5
=2.33×(5×0.4×0.5)
=2.33×1
=2.33;
(4)0.8×630×0.125
=(0.8×0.125)×630
=0.1×630
=63;
(5)0.13×102
=0.13×100+0.13×2
=13+0.26
=13.26;
(6)3.12×4+1.88×4
=(3.12+1.88)×4
=5×4
=20.
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