赚现金
下列运算正确的是 ( )
a 2 · a 3 = a 6
a 3 ÷ a = a 3
( a 2 ) 3 = a 5
( a 2 b ) 2 = a 4 b 2
a · a 3 = a 3
( 2 a ) 3 = 6 a 3
a 6 ÷ a 3 = a 2
( a 2 ) 3 - ( - a 3 ) 2 = 0
a · a 3 = a 4
2 a - a = 2
( a 2 ) 5 = a 7
( - 3 b ) 2 = 6 b 2
下列计算正确的是 ( )
A. a 2 + a 2 = a 4 B. ( a + b ) 2 = a 2 + b 2 C. ( a 3 ) 3 = a 9 D. a 3 · a 2 = a 6
a 2 b + 2 a b 2 = 3 a 3 b 3
a 6 · a 3 = a 9
( a 3 ) 2 = a 5
下列算式的运算结果为 a 4 的是 ( )
A. a 4 · a B. ( a 2 ) 2 C. a 3 + a 3 D. a 4 ÷ a
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 2 + a 3 = a 5
a 6 ÷ a 2 = a 4
( 2 ab ) 3 = 6 a 3 b 3
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
A. a 2 · a 3 = a 6 B. a 6 ÷ a - 2 = a - 3
C. ( - 2 a b 2 ) 3 = - 8 a 3 b 6 D. ( 2 a + b ) 2 = 4 a 2 + b 2
A. a 2 + a 2 = a 4 B. a 3 ÷ a = a 3
C. a 2 ⋅ a 3 = a 5 D. ( a 2 ) 4 = a 6
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
下列运算中,正确的是 ( )
A. a 4 · a 4 = a 16 B. a + 2 a 2 = 3 a 3 C. a 3 ÷ ( - a ) = - a 2 D. ( - a 3 ) 2 = a 5
A. 7 a + a = 7 a 2 B. a 2 ⋅ a 3 = a 6 C. a 3 ÷ a = a 2 D. ( ab ) 2 = a b 2
下列各式中,计算正确的是 ( )
a 3 + a 2 = a 5
a 3 - a 2 = a
a 2 · a 3 = a 5
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