问题
解答题
计算,能简算的要简算.
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答案
(1)125×32×25,
=125×(8×4)×25,
=(125×8)×(4×25),
=1000×100,
=100000;
(2)101×87-87,
=(101-1)×87,
=100×87,
=8700;
(3)56×67+33×56,
=56×(67+33),
=56×100,
=5600;
(4)9+4.98+1.02+21.1,
=(4.98+1.02)+(9+21.1),
=6+30.1,
=36.1;
(5)13.05+12.38-4.05,
=(13.5-4.05)+12.38,
=9+12.38,
=21.38;
(6)24.52-(7.5+4.52),
=24.52-4.52-7.5,
=20-7.5,
=12.5.