赚现金
下列运算正确的是 ( )
( - a ) 2 = - a 2
2 a 2 - a 2 = 2
a 2 ⋅ a = a 3
( a - 1 ) 2 = a 2 - 1
下列等式成立的是 ( )
a 3 + a 3 = a 6
a ⋅ a 3 = a 3
( a − b ) 2 = a 2 − b 2
( − 2 a 3 ) 2 = 4 a 6
2 a - a = 2
a 6 ÷ a 3 = a 2
( 2 a 3 ) 2 = 4 a 6
下列计算中,正确的是 ( )
( a + 3 ) 2 = a 2 + 9
a 8 ÷ a 4 = a 2
2 ( a - b ) = 2 a - b
a 2 + a 2 = 2 a 2
已知(x+y)2=8,(x﹣y)2=2,则x2+y2+xy= .
下列计算正确的是 ( )
a − ( b + c ) = a − b + c
( x + 1 ) 2 = x 2 + 1
2 a 2 ⋅ ( − 2 a b 2 ) 2 = − 16 a 4 b 4
下列运算中,正确的是( )
3 a + 2 b = 5 ab
( − 2 a ) 2 = − 4 a 2
( a + 1 ) 2 = a 2 + 2 a + 1
a 3 · a 4 = a 12
下列运算正确的是( )
5 a 2 - 2 b 2 = 3
7 a + a = 7 a 2
( x - 1 ) 2 = x 2 + 1 - 2 x
5 a 2 - 4 a 2 = 1
( - a 2 b 3 ) 2 = a 4 b 6
a 9 ÷ a 3 = a 3
( a - 2 b ) 2 = a 2 - 4 b 2
( a - 1 2 ) 2 = a 2 - 1 4
( a + 3 ) ( a - 3 ) = a 2 - 9
- 2 ( 3 a + 1 ) = - 6 a - 1
( a + b ) ( a - 2 b ) = a 2 - 2 b 2
( − 3 a 2 ) 3 = − 9 a 6
( − a ) 2 ⋅ a 3 = a 5
( 2 x − y ) 2 = 4 x 2 − y 2
a 2 + 4 a 2 = 5 a 4
x 2 + x 3 = x 5
( x - y ) 2 = x 2 - y 2
( x 2 ) 3 = x 6
x 6 ÷ x 3 = x 2
已知(m-n)2=32,(m+n)2=4000,则m2+n2的值为( )
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