赚现金
下列运算中,正确的是 ( )
A. a 2 · a 3 = a 5 B. 2 a − a = 2 C. ( a + b ) 2 = a 2 + b 2 D. 2 a + 3 b = 5 ab
下列运算正确的是 ( )
x 2 + x 4 = x 6
( - x 3 ) 3 = x 6
x 2 · x 3 = x 6
2 x 2 y - 2 y x 2 = 0
下列计算正确的是 ( )
A. 3 x 2 − 2 x 2 = 1 B. − x 3 = x − x
C. x ÷ y · 1 y = x D. x 2 · x 3 = x 5
计算: .
A. a 2 · a 5 = a 10 B. ( 3 a 3 ) 2 = 6 a 6
C. ( a + b ) 2 = a 2 + b 2 D. ( a + 2 ) ( a − 3 ) = a 2 − a − 6
若,则的值为 .
A. a 5 + a 5 = a 10 B. a 7 ÷ a = a 6
C. a 3 · a 2 = a 6 D. ( − a 3 ) 2 = − a 6
已知 10 a = 20 , 100 b = 50 ,则 1 2 a + b + 3 2 的值是 ( )
2
5 2
3
9 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
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
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 ) 3 = a 5
a 2 · a 3 = a 5
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