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> 计算:①27+(5-1)0-12;②(2-23)(2+23);③18-22+3;④25(420-345+25);⑤13-x2y•(-4-y2x)÷161x3y.-数学
计算:①27+(5-1)0-12;②(2-23)(2+23);③18-22+3;④25(420-345+25);⑤13-x2y•(-4-y2x)÷161x3y.-数学
题目简介
计算:①27+(5-1)0-12;②(2-23)(2+23);③18-22+3;④25(420-345+25);⑤13-x2y•(-4-y2x)÷161x3y.-数学
题目详情
计算:
①
27
+(
5
-1
)
0
-
12
;
②
(
2
-2
3
)(
2
+2
3
)
;
③
18
-
2
2
+
3
;
④
2
5
(4
20
-3
45
+2
5
)
;
⑤
1
3
-
x
2
y
•(-4
-
y
2
x
)÷
1
6
1
x
3
y
.
题型:解答题
难度:中档
来源:不详
答案
(1)原式=
27
+1-
12
=3
3
-2
3
+1=
3
+1;
(2)原式=
(
2
)
2
-
(2
3
)
2
=2-12=-10;
(3)原式=3
2
-
2
+
3
=2
2
+
3
;
(4)原式=2
5
(8
5
-9
5
+2
5
)=2
5
×
5
=10;
(5)原式=-
class="stub"x
3
-
class="stub"1
y
×4y
class="stub"-1
x
÷
class="stub"1
6x
class="stub"1
xy
=-8x2y.
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题目简介
计算:①27+(5-1)0-12;②(2-23)(2+23);③18-22+3;④25(420-345+25);⑤13-x2y•(-4-y2x)÷161x3y.-数学
题目详情
①
②(
③
④2
⑤
答案
(2)原式=(
(3)原式=3
(4)原式=2
(5)原式=-