计算 能简算的要简算10÷0.2÷2.564×4.5+3.6×451.25×3.2×0.814.5×1028.4÷0.21÷0.50.8×[(5-0.68)÷1.2].
除法
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(1)10÷0.2÷2.5
=50÷2.5,
=20;(2)64×4.5+3.6×45
=6.4×45+3.6×45,
=(6.4+3.6)×45,
=10×45,
=450;(3)1.25×3.2×0.8
=1.25×0.8×3.2,
=1×3.2,
=3.2;(4)14.5×102
=14.5×(100+2),
=14.5×100+14.5×2,
=1450+29,
=1479;(5)8.4÷0.21÷0.5
=40÷0.5,
=80;(6)0.8×[(5-0.68)÷1.2].
=0.8×[4.32÷1.2],
=0.8×3.6,
=2.88.
