题目内容
计算,能简算的要简算. 2400÷80-14×2 |
43×202 |
185×38+15×38 | 160×25 |
420÷[(205-198)×4] | 96×101-96. |
分析:(1)同时运算除法和乘法,再算减法;
(2)先把202分解成200+2,再运用乘法分配律简算;
(3)(6)运用乘法分配律简算;
(4)先把160分解成40×4,再运用乘法结合律简算;
(5)先算小括号里面的减法,再根据除法的性质简算.
(2)先把202分解成200+2,再运用乘法分配律简算;
(3)(6)运用乘法分配律简算;
(4)先把160分解成40×4,再运用乘法结合律简算;
(5)先算小括号里面的减法,再根据除法的性质简算.
解答:解:(1)2400÷80-14×2,
=30-28,
=2;
(2)43×202,
=43×(200+2),
=43×200+43×2,
=8600+86,
=8686;
(3)185×38+15×38,
=(185+15)×38,
=200×38,
=7600;
(4)160×25,
=40×4×25,
=40×(4×25),
=40×100,
=4000;
(5)420÷[(205-198)×4],
=420÷[7×4],
=420÷7÷4,
=60÷4,
=15;
(6)96×101-96,
=96×(101-1),
=96×100,
=9600.
=30-28,
=2;
(2)43×202,
=43×(200+2),
=43×200+43×2,
=8600+86,
=8686;
(3)185×38+15×38,
=(185+15)×38,
=200×38,
=7600;
(4)160×25,
=40×4×25,
=40×(4×25),
=40×100,
=4000;
(5)420÷[(205-198)×4],
=420÷[7×4],
=420÷7÷4,
=60÷4,
=15;
(6)96×101-96,
=96×(101-1),
=96×100,
=9600.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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