题目内容
计算下面各题,能简算的要用简便方法计算. 96÷0.24÷4 |
2.56×99 |
19.98÷5.4-2.08 |
7.8×99+7.8 | 14.56÷0.26×7.01 | 5.78+0.25×1.6. |
考点:小数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据整数除法的性质进行解答即可;
(2)运用乘法的分配律进行简算;
(3)先算除法,再算减法;
(4)运用乘法的分配律进行简算;
(5)先算除法,再算乘法;
(6)先算乘法,再算加法.
(2)运用乘法的分配律进行简算;
(3)先算除法,再算减法;
(4)运用乘法的分配律进行简算;
(5)先算除法,再算乘法;
(6)先算乘法,再算加法.
解答:
解:(1)96÷0.24÷4
=96÷(0.24×4)
=96÷0.96
=100;
(2)2.56×99
=2.56×(100-1)
=2.56×100-2.56×1
=256-2.56
=253.44;
(3)19.98÷5.4-2.08
=3.7-2.08
=1.62;
(4)7.8×99+7.8
=7.8×(99+1)
=7.8×100
=780;
(5)14.56÷0.26×7.01
=56×7.01
=392.56;
(6)5.78+0.25×1.6
=5.78+0.4
=6.18.
=96÷(0.24×4)
=96÷0.96
=100;
(2)2.56×99
=2.56×(100-1)
=2.56×100-2.56×1
=256-2.56
=253.44;
(3)19.98÷5.4-2.08
=3.7-2.08
=1.62;
(4)7.8×99+7.8
=7.8×(99+1)
=7.8×100
=780;
(5)14.56÷0.26×7.01
=56×7.01
=392.56;
(6)5.78+0.25×1.6
=5.78+0.4
=6.18.
点评:此题考查了小数四则混合运算的顺序,灵活运用运算定律进行简算.
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