题目内容
计算下面各题,能简算的要简算.
68×(
-
); (1-
÷
)×
;
÷
+
×
; 48×
.
68×(
| 3 |
| 4 |
| 11 |
| 17 |
| 3 |
| 10 |
| 6 |
| 7 |
| 10 |
| 13 |
| 5 |
| 12 |
| 9 |
| 4 |
| 7 |
| 12 |
| 4 |
| 9 |
| 10 |
| 47 |
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)先算除法,再算减法,最后算乘法;
(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)先算除法,再算减法,最后算乘法;
(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)68×(
-
)
=68×
-68×
=51-44
=7;
(2)(1-
÷
)×
=(1-
)×
=
×
=
;
(3)
÷
+
×
=
×
+
×
=(
+
)×
=1×
=
;
(4)48×
=(47+1)×
=47×
+1×
=10+
=10
.
| 3 |
| 4 |
| 11 |
| 17 |
=68×
| 3 |
| 4 |
| 11 |
| 17 |
=51-44
=7;
(2)(1-
| 3 |
| 10 |
| 6 |
| 7 |
| 10 |
| 13 |
=(1-
| 7 |
| 20 |
| 10 |
| 13 |
=
| 13 |
| 20 |
| 10 |
| 13 |
=
| 1 |
| 2 |
(3)
| 5 |
| 12 |
| 9 |
| 4 |
| 7 |
| 12 |
| 4 |
| 9 |
=
| 5 |
| 12 |
| 4 |
| 9 |
| 7 |
| 12 |
| 4 |
| 9 |
=(
| 5 |
| 12 |
| 7 |
| 12 |
| 4 |
| 9 |
=1×
| 4 |
| 9 |
=
| 4 |
| 9 |
(4)48×
| 10 |
| 47 |
=(47+1)×
| 10 |
| 47 |
=47×
| 10 |
| 47 |
| 10 |
| 47 |
=10+
| 10 |
| 47 |
=10
| 10 |
| 47 |
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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