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下列计算错误的是 ( )
( - 3 a b 2 ) 2 = 9 a 2 b 4
- 6 a 3 b ÷ 3 ab = - 2 a 2
( a 2 ) 3 - ( - a 3 ) 2 = 0
( x + 1 ) 2 = x 2 + 1
下列计算正确的是 ( )
x 2 · x 3 = x 6
x y 2 - 1 4 x y 2 = 3 4 x y 2
( x + y ) 2 = x 2 + y 2
( 2 x y 2 ) 2 = 4 x y 4
下列计算结果正确的是 ( )
a 2 + a 2 = a 4
( a 3 ) 2 = a 5
( a + 1 ) 2 = a 2 + 1
a · a = a 2
已知 a + b = 3 , a 2 + b 2 = 5 ,则 ab = .
2 x + 3 y = 5 xy
( x + 1 ) ( x - 2 ) = x 2 - x - 2
a 2 · a 3 = a 6
( a - 2 ) 2 = a 2 - 4
下列运算正确的是 ( )
( - 2 ) 2 = - 2
( x - y ) 2 = x 2 - y 2
2 + 3 = 5
( - 3 a ) 2 = 9 a 2
a 2 + b 2 = ( a + b ) 2
a 2 + a 4 = a 6
a 10 ÷ a 5 = a 2
a 2 · a 3 = a 5
a ( a + 1 ) = a 2 + a
( a - b ) 2 = a 2 - b 2
2 a + 3 b = 5 ab
x 3 + x 4 = x 7
x 3 · x 2 = x 6
( - 3 x ) 2 = 9 x 2
下列各运算中,计算正确的是 ( )
a 2 · 2 a 2 = 2 a 4
x 8 ÷ x 2 = x 4
( x - y ) 2 = x 2 - xy + y 2
( - 3 x 2 ) 3 = - 9 x 6
a 2 · a 5 = a 10
a 6 ÷ a 2 = a 3
( - a 2 ) 4 = a 8
( a + b ) ( a - 2 b ) = a 2 - 2 b 2
( a - 1 2 ) 2 = a 2 - 1 4
- 2 ( 3 a - 1 ) = - 6 a + 1
( a + 3 ) ( a - 3 ) = a 2 - 9
4 m - m = 4
( a 2 ) 3 = a 5
- ( t - 1 ) = 1 - t
2 a + a = 2 a 2
( - a ) 2 = - a 2
( a - 1 ) 2 = a 2 - 1
( ab ) 2 = a 2 b 2
( a 4 b ) 3 = a 7 b 3
- 2 b ( 4 a - b 2 ) = - 8 ab - 2 b 3
a a 3 + a 2 a 2 = 2 a 4
( a - 5 ) 2 = a 2 - 25
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