题目内容
选择适合你的方法计算,并写出过程.
(1)208×13-3672÷18
(2)4×505×25
(3)[332-(32+278)]×186
(4)30×(1836÷18+18×11)
(5)40×(250×88)
(6)125×808
(7)32×64-23×64+64
(8)(24+24+24)×25.
(1)208×13-3672÷18
(2)4×505×25
(3)[332-(32+278)]×186
(4)30×(1836÷18+18×11)
(5)40×(250×88)
(6)125×808
(7)32×64-23×64+64
(8)(24+24+24)×25.
分析:(1)(4)依据四则混合运算的顺序进行计算,
(2)(5)运用乘法交换律和结合律简算,
(6)(7)运用乘法分配律简算,
(3)依据减法性质简算,
(8)依据乘法性质以及乘法结合律简算.
(2)(5)运用乘法交换律和结合律简算,
(6)(7)运用乘法分配律简算,
(3)依据减法性质简算,
(8)依据乘法性质以及乘法结合律简算.
解答:解:(1)208×13-3672÷18,
=2704-204,
=2500;
(2)4×505×25,
=4×25×505,
=100×505,
=50500;
(3)[332-(32+278)]×186,
=[332-32-278]×186,
=[300-278]×186,
=22×186,
=4092;
(4)30×(1836÷18+18×11),
=30×(102+198),
=30×300,
=9000;
(5)40×(250×88),
=40×250×88,
=10000×88,
=880000;
(6)125×808,
=125×800+125×8,
=100000+1000,
=101000;
(7)32×64-23×64+64,
=(32-23+1)×64,
=10×64,
=640;
(8)(24+24+24)×25,
=24×3×25,
=4×25×6×3,
=100×6×3,
=1800.
=2704-204,
=2500;
(2)4×505×25,
=4×25×505,
=100×505,
=50500;
(3)[332-(32+278)]×186,
=[332-32-278]×186,
=[300-278]×186,
=22×186,
=4092;
(4)30×(1836÷18+18×11),
=30×(102+198),
=30×300,
=9000;
(5)40×(250×88),
=40×250×88,
=10000×88,
=880000;
(6)125×808,
=125×800+125×8,
=100000+1000,
=101000;
(7)32×64-23×64+64,
=(32-23+1)×64,
=10×64,
=640;
(8)(24+24+24)×25,
=24×3×25,
=4×25×6×3,
=100×6×3,
=1800.
点评:本题主要考查四则混合运算的运算顺序以及正确运用简便方法解决问题的能力.
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