题目内容

用递等式计算,能简便计算的要简便计算.
0.125×0.5×0.8

60.4×0.8-12.8
2.8+0.6×0.35 0.2÷2.5
104×0.45 0.9×3.6+1.1×0.36.
分析:(1)运用乘法交换律简算;
(2)先算乘法,再算减法;
(3)先算乘法,再算加法;
(4)根据商不变规律简算;
(5)先把104分解成100+4,再运用乘法分配律简算;
(6)运用乘法分配律简算.
解答:解:(1)0.125×0.5×0.8,
=0.125×0.8×0.5,
=0.1×0.5,
=0.05;

(2)60.4×0.8-12.8,
=48.32-12.8,
=35.52;

(3)2.8+0.6×0.35,
=2.8+0.21,
=3.01;

(4)0.2÷2.5,
=(0.2×4)÷(2.5×4),
=0.8÷10,
=0.08;

(5)104×0.45,
=(100+4)×0.45,
=100×0.45+4×0.45,
=45+1.8,
=46.8;

(6)0.9×3.6+1.1×0.36,
=(0.9+1.1)×3.6,
=2×3.6,
=7.2.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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