题目内容
计算下列各题,能简算的要简算(8分,每题2分).
①
×
-
÷5
②(
-
)×24
③4-
÷
-
④
×
÷
×
.
①
6 |
5 |
6 |
7 |
6 |
7 |
②(
1 |
4 |
1 |
6 |
③4-
9 |
15 |
9 |
5 |
2 |
3 |
④
5 |
12 |
4 |
5 |
5 |
12 |
4 |
5 |
考点:分数的简便计算
专题:运算定律及简算
分析:①把除法变为乘法,运用乘法分配律简算.
②运用乘法分配律简算.
③先算除法,运用减法的性质简算.
④把除法变为乘法,运用乘法交换律与结合律简算.
②运用乘法分配律简算.
③先算除法,运用减法的性质简算.
④把除法变为乘法,运用乘法交换律与结合律简算.
解答:
解:①
×
-
÷5
=
×
-
×
=(
-
)×
=1×
=
;
②(
-
)×24
=
×24-
×24
=6-4
=2;
③4-
÷
-
=4-
×
-
=4-
-
=4-(
+
)
=4-1
=3;
④
×
÷
×
=
×
×
×
=(
×
)×(
×
)
=1×
=
.
6 |
5 |
6 |
7 |
6 |
7 |
=
6 |
5 |
6 |
7 |
6 |
7 |
1 |
5 |
=(
6 |
5 |
1 |
5 |
6 |
7 |
=1×
6 |
7 |
=
6 |
7 |
②(
1 |
4 |
1 |
6 |
=
1 |
4 |
1 |
6 |
=6-4
=2;
③4-
9 |
15 |
9 |
5 |
2 |
3 |
=4-
9 |
15 |
5 |
9 |
2 |
3 |
=4-
1 |
3 |
2 |
3 |
=4-(
1 |
3 |
2 |
3 |
=4-1
=3;
④
5 |
12 |
4 |
5 |
5 |
12 |
4 |
5 |
=
5 |
12 |
4 |
5 |
12 |
5 |
4 |
5 |
=(
5 |
12 |
12 |
5 |
4 |
5 |
4 |
5 |
=1×
16 |
25 |
=
16 |
25 |
点评:此题主要考查分数四则混合运算的运算顺序和应用运算定律进行简便计算.
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