题目内容
简便运算
52.8-13.5-6.5-2.8
×25%+0.25-
×
(
+
)×27÷
+
÷(
-
)
52.8-13.5-6.5-2.8
11 |
24 |
1 |
4 |
7 |
24 |
(
2 |
39 |
2 |
27 |
1 |
39 |
1 |
6 |
7 |
12 |
3 |
4 |
1 |
6 |
考点:分数的简便计算,运算定律与简便运算,分数的四则混合运算,整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据减法的性质简算;
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算括号外的加法.
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算括号外的加法.
解答:
解:(1)52.8-13.5-6.5-2.8
=(52.8-2.8)-(13.5+6.5)
=50-20
=30;
(2)
×25%+0.25-
×
=(
+1-
)×
=
×
=
;
(3)(
+
)×27÷
=(
+
)×27×39
=
×39×27+
×27×39
=2×27+2×39
=54+78
=132;
(4)
+
÷(
-
)
=
+
÷
=
+1
=1
.
=(52.8-2.8)-(13.5+6.5)
=50-20
=30;
(2)
11 |
24 |
1 |
4 |
7 |
24 |
=(
11 |
24 |
7 |
24 |
1 |
4 |
=
42 |
24 |
1 |
4 |
=
7 |
16 |
(3)(
2 |
39 |
2 |
27 |
1 |
39 |
=(
2 |
39 |
2 |
27 |
=
2 |
39 |
2 |
27 |
=2×27+2×39
=54+78
=132;
(4)
1 |
6 |
7 |
12 |
3 |
4 |
1 |
6 |
=
1 |
6 |
7 |
12 |
7 |
12 |
=
1 |
6 |
=1
1 |
6 |
点评:此题主要考查分数、整数、小数的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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