题目内容
计算下面各题,能简算的要简算 6.25÷0.25÷4 | 90÷25÷4 | 68.04÷(68.04×3.6) |
1.25×11×4×0.8 | 10.2×5.7 | 8.3×49+8.3 |
0.486+0.01+3.99 | 7.5×2.3-7.5×2.3 | 8.93×5.7+8.93×3.3+8.93 |
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)(2)(3)运用除法的性质简算.
(4)运用乘法交换律与结合律简算
(5)把10.2看作10+0.2,运用乘法分配律简算.
(6)(7)(8)运用乘法分配律简算.
(7)运用加法结合律简算.
(4)运用乘法交换律与结合律简算
(5)把10.2看作10+0.2,运用乘法分配律简算.
(6)(7)(8)运用乘法分配律简算.
(7)运用加法结合律简算.
解答:
解:(1)6.25÷0.25÷4
=6.25÷(0.25×4)
=6.25÷1
=6.25
(2)90÷25÷4
=90÷(25×4)
=90÷100
=0.9
(3)68.04÷(68.04×3.6)
=68.04÷68.04÷3.6
=1÷3.6
=
(4)1.25×11×4×0.8
=(1.25×0.8)×(11×4)
=1×44
=44
(5)10.2×5.7
=(10+0.2)×5.7
=10×5.7+0.2×5.7
=57+1.14
=58.14
(6)8.3×49+8.3
=8.3×(49+1)
=8.3×50
=415
(7)0.486+0.01+3.99
=0.486+(0.01+3.99)
=0.486+4
=4.486
(8)7.5×2.3-7.5×2.3
=7.5×(2.3-2.3)
=0
(9)8.93×5.7+8.93×3.3+8.93
=8.93×(5.7+3.3+1)
=8.93×10
=89.3
=6.25÷(0.25×4)
=6.25÷1
=6.25
(2)90÷25÷4
=90÷(25×4)
=90÷100
=0.9
(3)68.04÷(68.04×3.6)
=68.04÷68.04÷3.6
=1÷3.6
=
5 |
18 |
(4)1.25×11×4×0.8
=(1.25×0.8)×(11×4)
=1×44
=44
(5)10.2×5.7
=(10+0.2)×5.7
=10×5.7+0.2×5.7
=57+1.14
=58.14
(6)8.3×49+8.3
=8.3×(49+1)
=8.3×50
=415
(7)0.486+0.01+3.99
=0.486+(0.01+3.99)
=0.486+4
=4.486
(8)7.5×2.3-7.5×2.3
=7.5×(2.3-2.3)
=0
(9)8.93×5.7+8.93×3.3+8.93
=8.93×(5.7+3.3+1)
=8.93×10
=89.3
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
练习册系列答案
相关题目
320×5的积的末尾有( )
A、没有0 | B、一个0 |
C、两个0 | D、三个0 |