题目内容
计算下面各题.
624-3.2×1.5÷0.1
9.43+0.78-2.43
5.7×2.8+5.7×6.2+5.7
7.6×5+2.4÷
.
624-3.2×1.5÷0.1
9.43+0.78-2.43
5.7×2.8+5.7×6.2+5.7
7.6×5+2.4÷
1 |
5 |
考点:小数四则混合运算
专题:运算顺序及法则
分析:(1)先算乘法,再算除法,最后算减法;
(2)根据加法交换律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
(2)根据加法交换律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
解答:
解:(1)624-3.2×1.5÷0.1
=624-4.8÷0.1
=624-48
=576;
(2)9.43+0.78-2.43
=9.43-2.43+0.78
=7+0.78
=7.78;
(3)5.7×2.8+5.7×6.2+5.7
=5.7×(2.8+6.2+1)
=5.7×10
=57;
(4)7.6×5+2.4÷
=7.6×5+2.4×5
=(7.6+2.4)×5
=10×5
=50.
=624-4.8÷0.1
=624-48
=576;
(2)9.43+0.78-2.43
=9.43-2.43+0.78
=7+0.78
=7.78;
(3)5.7×2.8+5.7×6.2+5.7
=5.7×(2.8+6.2+1)
=5.7×10
=57;
(4)7.6×5+2.4÷
1 |
5 |
=7.6×5+2.4×5
=(7.6+2.4)×5
=10×5
=50.
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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