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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
下列运算正确的是 ( )
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
计算 a 2 ⋅ a 的结果是 ( )
a 2
a 3
a
2 a 2
a 2 + a = a 3
( a 2 ) 3 = a 5
a 8 ÷ a 2 = a 4
a 2 ⋅ a 3 = a 5
2 a - a = 2
( a 2 ) 3 = a 6
a 2 ⋅ a 3 = a 6
( ab ) 2 = a b 2
a 3 ⋅ a 2 = a 5
2 a + 3 a = 6 a
下列运算结果正确的是 ( )
3 a - a = 2
a 2 ⋅ a 4 = a 8
( a + 2 ) ( a - 2 ) = a 2 - 4
( - a ) 2 = - a 2
下列式子正确的是 ( )
a 3 - a 2 = a
a 3 ⋅ a 2 = a 6
下列运算结果为 a 6 的是 ( )
a 2 ⋅ a 3
a 12 ÷ a 2
( a 3 ) 2
( 1 2 a 3 ) 2
a 2 + a 2 = a 4
( a 3 ) 2 = a 5
a 3 a 2 = a ( a ≠ 0 )
x 3 + x 3 = x 6
2 x 3 - x 3 = x 3
( x 3 ) 2 = x 5
x 3 ⋅ x 3 = x 9
a 3 ÷ a 3 = a 6
a 3 ⋅ a 3 = a 6
( a 3 ) 3 = a 6
( a b 3 ) 2 = a b 6
a - 2 = - a 2
a 2 + a 3 = a 5
a 3 ⋅ a 3 = 2 a 3
( - 2 a ) 2 = 4 a 2
( a + b ) 2 = a 2 + b 2
( a + 2 ) ( a - 2 ) = a 2 - 2
a 2 ⋅ a = a 3
5 a - 4 a = 1
a 6 ÷ a 3 = a 2
( 2 a ) 3 = 6 a 3
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