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下列运算结果正确的是 ( )
( - a ) 3 = a 3
a 9 ÷ a 3 = a 3
a + 2 a = 3 a
a · a 2 = a 2
下列计算正确的是 ( )
a 2 b + 2 a b 2 = 3 a 3 b 3
a 6 ÷ a 3 = a 2
a 6 · a 3 = a 9
( a 3 ) 2 = a 5
下列运算中正确的是 ( )
( a 2 ) 3 = a 5
( 1 2 ) - 1 = - 2
( 2 - 5 ) 0 = 1
a 3 · a 3 = 2 a 6
下列运算正确的是 ( )
a 2 + a 3 = a 5
a 6 ÷ a 2 = a 4
( 2 ab ) 3 = 6 a 3 b 3
a 2 · a 3 = a 6
下列各式中,计算正确的是 ( )
a 3 + a 2 = a 5
a 3 - a 2 = a
a 2 · a 3 = a 5
( - a ) 4 = a 4
8 - 2 = 6
2 a 3 + 3 a 2 = 5 a 5
a 2 + b 2 = ( a + b ) 2
a 2 + a 4 = a 6
a 10 ÷ a 5 = a 2
下列运算一定正确的是 ( )
a + a = a 2
( a 3 ) 4 = a 12
( ab ) 2 = a b 2
3 a - a = 2
a · a 2 = a 3
a 6 ÷ a 2 = a 3
( 3 a 2 ) 2 = 6 a 4
8 a - 3 b = 5 ab
a 2 · a = a 3
a ( a + 1 ) = a 2 + a
( a - b ) 2 = a 2 - b 2
2 a + 3 b = 5 ab
( x + y ) 2 = x 2 + y 2
x 3 + x 4 = x 7
x 3 · x 2 = x 6
( - 3 x ) 2 = 9 x 2
b 2 · b 3 = b 6
( a 2 ) 3 = a 6
- a 2 ÷ a = a
( a 3 ) 2 · a = a 6
a 2 · a 5 = a 10
( a - 2 ) 2 = a 2 - 4
( - a 2 ) 4 = a 8
a 3 ÷ a = a 3
( a 2 ) 4 = a 6
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