题目内容
| 计算.(能简算的要简算) 1.02×99 |
|
(
| ||||||||||
10-
|
88×
|
0.32×6.7+3.2×0.33 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)先算括号里面的加法,再算除法,最后算括号外面的加法;
(4)根据减法的性质进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)先算括号里面的加法,再算除法,最后算括号外面的加法;
(4)根据减法的性质进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
解答:
解:(1)1.02×99
=1.02×(100-1)
=1.02×100-1.02×1
=102-1.02
=100.98;
(2)
×153-0.6×53
=0.6×153-0.6×53
=0.6×(153-53)
=0.6×100
=60;
(3)(
+
)÷
+
=
÷
+
=
+
=
;
(4)10-
-
+
=10-(
+
)+
=10-1+
=9+
=9
;
(5)88×
=(89-1)×
=89×
-1×
=88-
=87
;
(6)0.32×6.7+3.2×0.33
=0.32×6.7+0.32×3.3
=0.32×(6.7+3.3)
=0.32×10
=3.2.
=1.02×(100-1)
=1.02×100-1.02×1
=102-1.02
=100.98;
(2)
| 3 |
| 5 |
=0.6×153-0.6×53
=0.6×(153-53)
=0.6×100
=60;
(3)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
(4)10-
| 7 |
| 19 |
| 12 |
| 19 |
| 1 |
| 19 |
=10-(
| 7 |
| 19 |
| 12 |
| 19 |
| 1 |
| 19 |
=10-1+
| 1 |
| 19 |
=9+
| 1 |
| 19 |
=9
| 1 |
| 19 |
(5)88×
| 88 |
| 89 |
=(89-1)×
| 88 |
| 89 |
=89×
| 88 |
| 89 |
| 88 |
| 89 |
=88-
| 88 |
| 89 |
=87
| 1 |
| 89 |
(6)0.32×6.7+3.2×0.33
=0.32×6.7+0.32×3.3
=0.32×(6.7+3.3)
=0.32×10
=3.2.
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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