数学
计算:
(
5
+
3
+
2
)(
5
+
3
-
2
)(
5
-
3
+
2
)(-
5
+
3
+
2
)
=
24
24
.
(x-y)(x+y)(x
2
+y
2
)(x
4
+y
4
)(x
8
+y
8
)=
x
16
-y
16
x
16
-y
16
.
1001
1
-1001×1003=
1
1
;已知x
a
=3,x
b
=5,则x
3a-1b
=
17
15
17
15
.
计算:(3x+5y)·2xy=
6x
2
y+10xy
2
6x
2
y+10xy
2
;(x-1)(x+1)(x
2
+1)=
x
4
-1
x
4
-1
.
已知
x=1+
3
,那么
1
x+2
+
1
x
2
-4
-
1
x-2
=
-
3
2
-
3
2
.
计算:
(2
3
+
2
)(2
3
-
2
)
=
10
10
.
计算:(
5
-
3
+
2
)(
5
+
3
-
2
)=
2
6
2
6
.
(
3
-2)(
3
+2)
=
-1
-1
.
如果a
2
-
1
3
k=(a+
1
2
)(a-
1
2
),则k=
3
4
3
4
.
(-3m+s)(s+3m)=
n-9m
s
n-9m
s
.
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