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下列运算正确的是 ( )
A. x 8 ÷ x 4 = x 2 B. x + x 2 = x 3
C. x 3 · x 5 = x 15 D. ( − x 3 y ) 2 = x 6 y 2
( - a 3 ) 2 = - a 6
a 2 · a 3 = a 6
a 8 ÷ a 2 = a 4
3 a 2 - 2 a 2 = a 2
下列运算正确的是( )
A. ( a 3 ) 4 = a 12 B. a 3 • a 4 = a 12 C. a 2 + a 2 = a 4 D. ( ab ) 2 = a b 2
下列各式中,计算正确的是 ( )
a 3 · a 2 = a 6
a 3 + a 2 = a 5
a 6 ÷ a 3 = a 2
( a 3 ) 2 = a 6
a · a 3 = a 3
( 2 a ) 3 = 6 a 3
( a 2 ) 3 - ( - a 3 ) 2 = 0
m 2 · m 3 = m 6
( m 4 ) 2 = m 6
m 3 + m 3 = 2 m 3
( m - n ) 2 = m 2 - n 2
下列计算正确的是 ( )
a 2 · a 2 = 2 a 4
( - a 2 ) 3 = - a 6
3 a 2 - 6 a 2 = 3 a 2
( a - 2 ) 2 = a 2 - 4
a 6 + a 6 = a 12
a 6 × a 2 = a 8
a 6 ÷ a 2 = a 3
( a 6 ) 2 = a 8
下列各式正确的是 ( )
2 a 2 + 3 a 2 = 5 a 4
a 2 · a = a 3
( a 2 ) 3 = a 5
a 2 = a
下列运算结果正确的是 ( )
A. a 2 · a 3 = a 6 B. − ( a − b ) = − a + b
C. a 2 + a 2 = 2 a 4 D. a 8 ÷ a 4 = a 2
A. a 3 + a 3 = a 6 B. 3 a − a = 3
C. ( a 3 ) 2 = a 5 D. a · a 2 = a 3
A. a 8 ÷ a 4 = a 2 B. ( a 2 ) 2 = a 4
C. a 2 · a 3 = a 6 D. a 2 + a 2 = 2 a 4
下列算式中,结果等于的是
A.B.C.D.
( - a ) 2 = - a 2
2 a 2 - a 2 = 2
a 2 ⋅ a = a 3
( a - 1 ) 2 = a 2 - 1
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
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