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下列运算正确的是 ( )
A. a 3 + a 2 = 2 a 5 B. ( - a b 2 ) 3 = a 3 b 6
C. 2 a ( 1 - a ) = 2 a - 2 a 2 D. ( a + b ) 2 = a 2 + b 2
下列计算正确的是 ( )
A. 2 a · 3 a = 6 a B. ( - a 3 ) 2 = a 6 C. 6 a ÷ 2 a = 3 a D. ( - 2 a ) 3 = - 6 a 3
a ⋅ a 2 = a 3
a 6 ÷ a 2 = a 3
2 a 2 - a 2 = 2
( 3 a 2 ) 2 = 6 a 4
a 3 + a 2 = a 5
a 3 ÷ a 2 = a
a 3 · a 2 = a 6
( a 3 ) 2 = a 9
下列计算中,正确的是 ( )
( a 3 ) 4 = a 12
a 3 · a 5 = a 15
a 2 + a 2 = a 4
下列计算,正确的是 ( )
( - 2 ) - 2 = 4
( - 2 ) 2 = - 2
4 6 ÷ ( - 2 ) 6 = 64
8 - 2 = 6
3 2 - 2 = 3
a 6 ÷ a 3 = a 2
a 2 + a 3 = a 5
( 3 a 3 ) 2 = 9 a 6
A. 2 y 3 + y 3 = 3 y 6 B. y 2 ⋅ y 3 = y 6 C. ( 3 y 2 ) 3 = 9 y 6 D. y 3 ÷ y − 2 = y 5
下列各式中,运算正确的是 ( )
A. ( a 3 ) 2 = a 5 B. ( a − b ) 2 = a 2 − b 2
C. a 6 ÷ a 2 = a 4 D. a 2 + a 2 = 2 a 4
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
A. a 2 + 2 a = 3 a 3 B. ( − 2 a 3 ) 2 = 4 a 5
C. ( a + 2 ) ( a − 1 ) = a 2 + a − 2 D. ( a + b ) 2 = a 2 + b 2
A. − ( x − y ) 2 = − x 2 − 2 xy − y 2 B. a 2 + a 2 = a 4
C. a 2 · a 3 = a 6 D. ( x y 2 ) 2 = x 2 y 4
A. a 3 · a 2 = a 6 B. ( − a 2 ) 3 = a 6
C. a 7 ÷ a 5 = a 2 D. − 2 mn − mn = − mn
下列运算:① a 2 ⋅ a 3 = a 6 ,② ( a 3 ) 2 = a 6 ,③ a 5 ÷ a 5 = a ,④ ( ab ) 3 = a 3 b 3 ,其中结果正确的个数为 ( )
A.1B.2C.3D.4
A . a 2 · a 3 = a 6 B . ( − a 2 ) 3 = − a 5
C . a 10 ÷ a 9 = a ( a ≠ 0 ) D . ( − bc ) 4 ÷ ( − bc ) 2 = − b 2 c 2
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