题目内容
递等式计算(能简便的要简便) 0.11×1.8+8.2×0.11 |
3.24×0.4×2.5 |
15.2×101-15.2 |
6.4÷0.4÷2 |
4×(1.5+0.25) | 1.9-1.9×0.9 | 5.4÷(3.94+0.86)×0.8 | 13.6+4.5×2.2. |
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)根据乘法分配律进行简算;
(2)根据乘法结合律进行简算;
(3)根据乘法分配律进行简算;
(4)根据除法的性质进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算;
(7)先算加法,再算除法,最后算乘法;
(8)先算乘法,再算加法.
(2)根据乘法结合律进行简算;
(3)根据乘法分配律进行简算;
(4)根据除法的性质进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算;
(7)先算加法,再算除法,最后算乘法;
(8)先算乘法,再算加法.
解答:
解:(1)0.11×1.8+8.2×0.11
=0.11×(1.8+8.2)
=0.11×10
=1.1;
(2)3.24×0.4×2.5
=3.24×(0.4×2.5)
=3.24×1
=3.24;
(3)15.2×101-15.2
=15.2×(101-1)
=15.2×100
=1520;
(4)6.4÷0.4÷2
=6.4÷(0.4×2)
=6.4÷0.8
=8;
(5)4×(1.5+0.25)
=4×1.5+4×0.25
=6+1
=7;
(6)1.9-1.9×0.9
=1.9×(1-0.9)
=1.9×0.1
=0.19;
(7)5.4÷(3.94+0.86)×0.8
=5.4÷4.8×0.8
=1.125×0.8
=0.9;
(8)13.6+4.5×2.2
=13.6+9.9
=23.5.
=0.11×(1.8+8.2)
=0.11×10
=1.1;
(2)3.24×0.4×2.5
=3.24×(0.4×2.5)
=3.24×1
=3.24;
(3)15.2×101-15.2
=15.2×(101-1)
=15.2×100
=1520;
(4)6.4÷0.4÷2
=6.4÷(0.4×2)
=6.4÷0.8
=8;
(5)4×(1.5+0.25)
=4×1.5+4×0.25
=6+1
=7;
(6)1.9-1.9×0.9
=1.9×(1-0.9)
=1.9×0.1
=0.19;
(7)5.4÷(3.94+0.86)×0.8
=5.4÷4.8×0.8
=1.125×0.8
=0.9;
(8)13.6+4.5×2.2
=13.6+9.9
=23.5.
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.
练习册系列答案
相关题目