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下列运算正确的是 ( )
a 2 ⋅ a 4 = a 8
− a ( a − b ) = − a 2 − ab
( − 2 a ) 2 ÷ ( 2 a ) − 1 = 8 a 3
( a − b ) 2 = a 2 − b 2
下列各式中,正确的是( )
a - 2 = - a 2
a 2 + a 3 = a 5
a 2 ⋅ a 3 = a 6
( a 2 ) 3 = a 6
下列计算正确的是( )
a + a 2 = a 3
( 2 a 2 ) 3 = 2 a 6
a 6 ÷ a 2 = a 3
a 3 ⋅ a 2 = a 5
下列计算中正确的是( ).
a 2 ⋅ a = a 3
5 a - 4 a = 1
a 6 ÷ a 3 = a 2
( 2 a ) 3 = 6 a 3
下列各式运算正确的是( )
下列计算正确的是 ( )
x 2 + x 3 = x 5
2 x 3 − x 3 = 1
x 3 ⋅ x 4 = x 7
( − 2 x y 2 ) 3 = − 6 x 3 y 6
( - a ) 2 = - a 2
2 a 2 - a 2 = 2
( a - 1 ) 2 = a 2 - 1
下列运算中,正确的是 ( )
a 2 + a = a 3
( - ab ) 2 = - a b 2
a 5 ÷ a 2 = a 3
a 5 ⋅ a 2 = a 10
计算 ( - a ) 2 ⋅ a 4 的结果是 ( )
a 6
- a 6
a 8
- a 8
下列运算中,正确的是( )
a 2 • a 5 = a 10
( a ﹣ b ) 2 = a 2 ﹣ b 2
(﹣ 3 a 3 ) 2 = 6 a 6
﹣ 3 a 2 b + 2 a 2 b =﹣ a 2 b
x 2 ⋅ x = 2 x 2
( x y 3 ) 2 = x 2 y 6
x 6 ÷ x 3 = x 2
x 2 + x = x 3
不一定相等的一组是 ( )
a + b 与 b + a
3 a 与 a + a + a
a 3 与 a ⋅ a ⋅ a
3 ( a + b ) 与 3 a + b
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