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下列运算正确的是 ( )
( − 3 a 2 ) 3 = − 9 a 6
( − a ) 2 ⋅ a 3 = a 5
( 2 x − y ) 2 = 4 x 2 − y 2
a 2 + 4 a 2 = 5 a 4
已知2a=5,2b=3,求2a+b+3的值.
下列计算正确的是 ( )
a 3 ÷ a 3 = a 6
a 3 ⋅ a 3 = a 6
( a 3 ) 3 = a 6
( a b 3 ) 2 = a b 6
若am=3,an=5,则am+n等于( )
a 2 + a 2 = 2 a 4
a 2 ⋅ a = a 3
( 3 a ) 2 = 6 a 2
a 6 + a 2 = a 3
若2x=3,2y=5,则2x+y= .
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
下列各式中,正确的是( )
下列等式成立的是 ( )
a 3 + a 3 = a 6
a ⋅ a 3 = a 3
( a − b ) 2 = a 2 − b 2
( − 2 a 3 ) 2 = 4 a 6
( a 5 ) 2 = a 7
x 4 ⋅ x 4 = x 8
9 = ± 3
- 27 3 - 3 = 2 3
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
a + a 2 = a 3
( 2 a 2 ) 3 = 2 a 6
a 6 ÷ a 2 = a 3
a 3 ⋅ a 2 = a 5
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
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