题目内容
脱式计算
0.876÷7.3+2.04
0.78÷2.6+3.5×0.42
4.57×3.9+54.3×0.39
1.25×3.94×0.8.
0.876÷7.3+2.04
0.78÷2.6+3.5×0.42
4.57×3.9+54.3×0.39
1.25×3.94×0.8.
考点:小数四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算加法;
(2)先同时计算除法和乘法,再算加法;
(3)先变形为45.7×0.39+54.3×0.39,再根据乘法分配律计算即可求解;
(4)根据乘法交换律和结合律计算即可.
(2)先同时计算除法和乘法,再算加法;
(3)先变形为45.7×0.39+54.3×0.39,再根据乘法分配律计算即可求解;
(4)根据乘法交换律和结合律计算即可.
解答:
解:(1)0.876÷7.3+2.04
=0.12+2.04
=2.16;
(2)0.78÷2.6+3.5×0.42
=0.3+1.47
=1.77;
(3)4.57×3.9+54.3×0.39
=45.7×0.39+54.3×0.39
=(45.7+54.3)×0.39
=100×0.39
=39;
(4)1.25×3.94×0.8
=1.25×0.8×3.94
=1×3.94
=3.94.
=0.12+2.04
=2.16;
(2)0.78÷2.6+3.5×0.42
=0.3+1.47
=1.77;
(3)4.57×3.9+54.3×0.39
=45.7×0.39+54.3×0.39
=(45.7+54.3)×0.39
=100×0.39
=39;
(4)1.25×3.94×0.8
=1.25×0.8×3.94
=1×3.94
=3.94.
点评:考查了运算定律与简便运算,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简便计算.
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