问题
解答题
用简便方法计算
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答案
(1)25×99+25,
=25×(99+1),
=25×100,
=2500;
(2)75×75+75×25,
=75×(75+25),
=75×100,
=7500;
(3)64×125,
=8×8×125,
=8×(8×125),
=8×1000,
=8000;
(4)17+64+83+36,
=(17+83)+(64+36),
=100+100,
=200;
(5)1200-128-72,
=1200-(128+72),
=1200-200,
=1000;
(6)3000÷125÷8,
=3000÷(125×8),
=3000÷1000,
=3.