题目内容
计算,能简算的要简算. 1.08×0.8÷0.9 |
3.4×5.3+6.6×5.3 | 0.25×12.5×0.8×4 |
7.28+3.2÷2.5 | 1.8×102 | 44.28÷0.9÷4.1. |
分析:(1)(6)按照从左到右的顺序计算;
(2)运用乘法分配律简算;
(3)运用乘法结合律简算;
(4)先算除法,再算加法;
(5)把102分解成100+2,再运用乘法分配律简算.
(2)运用乘法分配律简算;
(3)运用乘法结合律简算;
(4)先算除法,再算加法;
(5)把102分解成100+2,再运用乘法分配律简算.
解答:解:(1)1.08×0.8÷0.9,
=0.864÷0.9,
=0.96;
(2)3.4×5.3+6.6×5.3,
=(3.4+6.6)×5.3,
=10×5.3,
=53;
(3)0.25×12.5×0.8×4,
=(0.25×4)×(12.5×0.8),
=1×10,
=10;
(4)7.28+3.2÷2.5,
=7.28+1.28,
=8.56;
(5)1.8×102,
=1.8×(100+2),
=1.8×100+1.8×2,
=180+3.6,
=183.6;
(6)44.28÷0.9÷4.1,
=49.2÷4.1,
=12.
=0.864÷0.9,
=0.96;
(2)3.4×5.3+6.6×5.3,
=(3.4+6.6)×5.3,
=10×5.3,
=53;
(3)0.25×12.5×0.8×4,
=(0.25×4)×(12.5×0.8),
=1×10,
=10;
(4)7.28+3.2÷2.5,
=7.28+1.28,
=8.56;
(5)1.8×102,
=1.8×(100+2),
=1.8×100+1.8×2,
=180+3.6,
=183.6;
(6)44.28÷0.9÷4.1,
=49.2÷4.1,
=12.
点评:本题考查了四则混合运算,要注意分析数据,选择合适的简算方法简算.
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