题目内容
用简便方法计算.
9×37+9×63
0.9+1.08+0.92+0.1
8×5×125×40
1.38+1.75+0.25.
9×37+9×63
0.9+1.08+0.92+0.1
8×5×125×40
1.38+1.75+0.25.
分析:(1)运用乘法分配律简算;
(2)运用加法交换律与结合律简算;
(3)运用乘法交换律与结合律简算;
(4)运用加法结合律简算.
(2)运用加法交换律与结合律简算;
(3)运用乘法交换律与结合律简算;
(4)运用加法结合律简算.
解答:解:(1)9×37+9×63,
=9×(37+63),
=9×100,
=900;
(2)0.9+1.08+0.92+0.1,
=(0.9+0.1)+(1.08+0.92),
=1+2,
=3;
(3)8×5×125×40,
=(8×125)×(5×40),
=1000×200,
=200000;
(4)1.38+1.75+0.25,
=1.38+(1.75+0.25),
=1.38+2,
=3.38.
=9×(37+63),
=9×100,
=900;
(2)0.9+1.08+0.92+0.1,
=(0.9+0.1)+(1.08+0.92),
=1+2,
=3;
(3)8×5×125×40,
=(8×125)×(5×40),
=1000×200,
=200000;
(4)1.38+1.75+0.25,
=1.38+(1.75+0.25),
=1.38+2,
=3.38.
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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