计算下面各题,能简算的要简算.30×(500-400÷25) 36×205 23×4×8×25 &nbs...
计算下面各题,能简算的要简算.30×(500-400÷25)36×20523×4×8×2575.64-(5.64-4.82)42.45-23.41+7.55(40-4)×...
计算下面各题,能简算的要简算.30×(500-400÷25) 36×205 23×4×8×25 75.64-(5.64-4.82) 42.45-23.41+7.55 (40-4)×25.
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(1)30×(500-400÷25),
=30×(500-16),
=30×484,
=14520;
(2)36×205,
=36×(200+5),
=36×200+36×5,
=7200+180,
=7380;
(3)23×4×8×25,
=(23×8)×(25×4),
=184×100,
=18400;
(4)75.64-(5.64-4.82),
=75.64-5.64+4.82,
=70+4.82,
=74.82;
(5)42.45-23.41+7.55,
=42.45+7.55-23.41,
=50-23.41,
=26.59;
(6)(40-4)×25,
=40×25-4×25,
=1000-100,
=900.
=30×(500-16),
=30×484,
=14520;
(2)36×205,
=36×(200+5),
=36×200+36×5,
=7200+180,
=7380;
(3)23×4×8×25,
=(23×8)×(25×4),
=184×100,
=18400;
(4)75.64-(5.64-4.82),
=75.64-5.64+4.82,
=70+4.82,
=74.82;
(5)42.45-23.41+7.55,
=42.45+7.55-23.41,
=50-23.41,
=26.59;
(6)(40-4)×25,
=40×25-4×25,
=1000-100,
=900.
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