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下列运算中,正确的是( )
下列运算正确的是 ( )
a 2 + a = a 3
( a 2 ) 3 = a 5
a 8 ÷ a 2 = a 4
a 2 ⋅ a 3 = a 5
的运算结果正确的是( )
计算: 2 × 2 - 1 = .
下列计算结果正确的是( )
下列计算正确的是 ( )
a 3 ⋅ a 2 = a 5
2 a + 3 a = 6 a
若22n+1·42=83(n为正整数),则n= .
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
下列计算正确的是
下列式子正确的是 ( )
a 3 - a 2 = a
( a 2 ) 3 = a 6
a 3 ⋅ a 2 = a 6
下列运算中,正确的是 ( )
( - 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
a + a 2 = a 3
( 2 a 2 ) 3 = 2 a 6
a 6 ÷ a 2 = a 3
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 2 ⋅ a = a 3
( a - 1 ) 2 = a 2 - 1
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