问题
解答题
计算下面各题,能简便计算的要简算
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答案
(1)125×88,
=125×(8×11),
=125×8×11,
=1000×11,
=11000;
(2)2008×99+2008,
=2008×(99+1),
=2008×100,
=200800;
(3)77-7.5+23-2.5,
=(77+23)-(7.5+2.5),
=100-10,
=90;
(4)520-360÷40×2,
=520-9×2,
=520-18,
=502;
(5)(520-360÷40)×2,
=(520-9)×2,
=511×2,
=1022;
(6)(520-360)÷(40×2),
=160÷80,
=2.