计算,能简算的要简算 10÷0.2÷2.5 8.4÷0.21÷0.5 1.25×3.2×0.25 14.5×102 14.64+3.7
计算,能简算的要简算10÷0.2÷2.58.4÷0.21÷0.51.25×3.2×0.2514.5×10214.64+3.7×2.83.5×0.7+7.5×0.7-0.7...
计算,能简算的要简算 10÷0.2÷2.5 8.4÷0.21÷0.5 1.25×3.2×0.25 14.5×102 14.64+3.7×2.8 3.5×0.7+7.5×0.7-0.7.
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①10÷0.2÷2.5,
=10÷(0.2×2.5),
=10÷0.5,
=20;
②8.4÷0.21÷0.5,
=40÷0.5,
=80;
③1.25×3.2×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;
④14.5×102,
=14.5×(100+2),
=14.5×100+14.5×2,
=1450+29,
=1479;
⑤14.64+3.7×2.8,
=14.64+10.36,
=25;
⑥3.5×0.7+7.5×0.7-0.7,
=0.7×(3.5+7.5-1),
=0.7×10,
=7.
=10÷(0.2×2.5),
=10÷0.5,
=20;
②8.4÷0.21÷0.5,
=40÷0.5,
=80;
③1.25×3.2×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;
④14.5×102,
=14.5×(100+2),
=14.5×100+14.5×2,
=1450+29,
=1479;
⑤14.64+3.7×2.8,
=14.64+10.36,
=25;
⑥3.5×0.7+7.5×0.7-0.7,
=0.7×(3.5+7.5-1),
=0.7×10,
=7.
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