下列运算结果正确的是 ( )
A. 3 a 3 · 2 a 2 = 6 a 6 B. ( - 2 a ) 2 = - 4 a 2 C. tan 45 ° = 2 2 D. cos 30 ° = 3 2
下列计算正确的是 ( )
3 ab - 2 ab = 1
( 3 a 2 ) 2 = 9 a 4
a 6 ÷ a 2 = a 3
3 a 2 · 2 a = 6 a 2
下列运算正确的是 ( )
A. a - ( b + c ) = a - b + c B. 2 a 2 · 3 a 3 = 6 a 5
C. a 3 + a 3 = 2 a 6 D. ( x + 1 ) 2 = x 2 + 1
以下计算正确的是 ( )
( - 2 a b 2 ) 3 = 8 a 3 b 6
3 ab + 2 b = 5 ab
( - x 2 ) · ( - 2 x ) 3 = - 8 x 5
2 m ( m n 2 - 3 m 2 ) = 2 m 2 n 2 - 6 m 3
A. 2 a · 5 a = 10 a B. ( - a 3 ) 2 + ( - a 2 ) 3 = a 5
C. ( - 2 a ) 3 = - 6 a 3 D. a 6 ÷ a 2 = a 4 ( a ≠ 0 )
下列计算错误的是 ( )
( a 3 b ) · ( a b 2 ) = a 4 b 3
( - m n 3 ) 2 = m 2 n 6
a 5 ÷ a - 2 = a 3
x y 2 - 1 5 x y 2 = 4 5 x y 2
下列运算中,正确的是 ( )
A. 2 x · 3 x 2 = 5 x 3 B. x 4 + x 2 = x 6 C. ( x 2 y ) 3 = x 6 y 3 D. ( x + 1 ) 2 = x 2 + 1
计算 3 a 2 · a 3 的结果是 ( )
4 a 5
4 a 6
3 a 5
3 a 6
A. ( 2 a 2 ) 2 = 2 a 4 B. 6 a 8 ÷ 3 a 2 = 2 a 4 C. 2 a 2 · a = 2 a 3 D. 3 a 2 − 2 a 2 = 1
下列计算中正确的是( )
A. a • a 2 = a 2 B. 2 a • a = 2 a 2
C. ( 2 a 2 ) 2 = 2 a 4 D. 6 a 8 ÷ 3 a 2 = 2 a 4
下列运算正确的是( )
A. m 6 ÷ m 2 = m 3 B. 3 m 2 ﹣ 2 m 2 = m 2 C. ( 3 m 2 ) 3 = 9 m 6 D. 1 2 m ⋅ 2 m 2 = m 2
下列计算,正确的是 ( )
A. a 5 + a 5 = a 10 B. a 3 ÷ a − 1 = a 2
C. a ⋅ 2 a 2 = 2 a 4 D. ( − a 2 ) 3 = − a 6
A. 3 a 2 - 6 a 2 = - 3 B. ( - 2 a ) · ( - a ) = 2 a 2
C. 10 a 10 ÷ 2 a 2 = 5 a 5 D. - ( a 3 ) 2 = a 6
5a﹣2a=3
x 8÷x 4=x 2
2x 3•3x 2=6x 5
(x+2y) 2=x 2+4y 2
﹣2x 2y•3xy 2=﹣6x 2y 2
(﹣x﹣2y)(x+2y)=x 2﹣4y 2
6x 3y 2÷2x 2y=3xy
(4x 3y 2) 2=16x 9y 4