题目内容
计算
6.28-40÷16×2.5; 1.8×
+2.2×
.
6.28-40÷16×2.5; 1.8×
1 |
4 |
1 |
4 |
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,再算乘法,最后算减法;
(2)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算.
解答:
解:(1)6.28-40÷16×2.5
=6.28-2.5×2.5
=6.28-6.25
=0.03;
(2)1.8×
+2.2×
=(1.8+2.2)×
=4×
=1.
=6.28-2.5×2.5
=6.28-6.25
=0.03;
(2)1.8×
1 |
4 |
1 |
4 |
=(1.8+2.2)×
1 |
4 |
=4×
1 |
4 |
=1.
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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