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下列各式中,计算结果不可能为a14的是( )
下列运算中,正确的是( )
下列计算结果正确的是( )
下列计算正确的是 ( )
( x 2 ) 3 = x 5
x 2 + x 2 = x 4
x 2 ⋅ x 3 = x 5
x 6 ÷ x 3 = x 2
下列运算正确的是 ( )
a + a 2 = a 3
( 2 a 2 ) 3 = 2 a 6
a 6 ÷ a 2 = a 3
a 3 ⋅ a 2 = a 5
( a 5 ) 2 = a 7
x 4 ⋅ x 4 = x 8
9 = ± 3
- 27 3 - 3 = 2 3
计算 3 2 × 3 − 1 的结果是 ( )
A.3B. − 3 C.2D. − 2
下列各式变形中,正确的是 ( )
A. x 2 ⋅ x 3 = x 6 B. x 2 = | x |
C. ( x 2 − 1 x ) ÷ x = x − 1 D. x 2 − x + 1 = ( x − 1 2 ) 2 + 1 4
A . a 2 + a 3 = a 5 B . a 2 × a 3 = a 6 C . ( a + b ) 2 = a 2 + b 2 D . ( a 2 ) 3 = a 6
下列运算结果是 a 5 的是 ( )
A. a 10 ÷ a 2 B. ( a 2 ) 3 C. ( − a ) 5 D. a 3 · a 2
A. − a 4 b ÷ a 2 b = − a 2 b B. ( a − b ) 2 = a 2 − b 2
C. a 2 · a 3 = a 6 D. − 3 a 2 + 2 a 2 = − a 2
已知 10 a = 20 , 100 b = 50 ,则 1 2 a + b + 3 2 的值是 ( )
2
5 2
3
9 2
A. a 2 · a 3 = a 6 B. a 3 + a 2 = a 5 C. ( a 2 ) 4 = a 8 D. a 3 − a 2 = a
下列运算中正确的是 ( )
A. ( a 2 ) 3 = a 5 B. ( 2 x + 1 ) ( 2 x − 1 ) = 2 x 2 − 1
C. a 8 · a 2 = a 4 D. ( a − 3 ) 2 = a 2 − 6 a + 9
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