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计算.(能简算的要简算)400×[(270+80)÷7]25×33×4×215.6+6.2-15.6+6.270-29.6-10.445+99×99+548×4×(125+25)

题目详情
计算.(能简算的要简算)
400×[(270+80)÷7] 25×33×4×2 15.6+6.2-15.6+6.2
70-29.6-10.4 45+99×99+54 8×4×(125+25)
400×[(270+80)÷7] 25×33×4×2 15.6+6.2-15.6+6.2
70-29.6-10.4 45+99×99+54 8×4×(125+25)
400×[(270+80)÷7] 25×33×4×2 15.6+6.2-15.6+6.2400×[(270+80)÷7]25×33×4×215.6+6.2-15.6+6.2 70-29.6-10.4 45+99×99+54 8×4×(125+25)70-29.6-10.445+99×99+548×4×(125+25)
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答案和解析
(1)400×[(270+80)÷7],
=400×[350÷7],
=400×50,
=20000;

(2)25×33×4×2,
=(25×4)×(33×2),
=100×66,
=6600;

(3)15.6+6.2-15.6+6.2,
=(15.6-15.6)+(6.2+6.2),
=0+12.4,
=12.4;

(4)70-29.6-10.4,
=70-(29.6+10.4),
=70-40,
=30;

(5)45+99×99+54,
=45+99×(100-1)+54,
=45+99×100-99×1+54,
=45+9900-99+54,
=(45+54-99)+9900,
=0+9900,
=9900;

(6)8×4×(125+25),
=(8×125×4)+(4×25×8),
=1000×4+100×8,
=4000+800,
=4800.