下列运算正确的是 ( )
a 2 · a 5 = a 10
( a - 2 ) 2 = a 2 - 4
a 6 ÷ a 2 = a 3
( - a 2 ) 4 = a 8
a 3 + a 2 = a 5
a 3 ÷ a = a 3
a 2 · a 3 = a 5
( a 2 ) 4 = a 6
下列计算正确的是 ( )
8 a - a = 7
a 2 + a 2 = 2 a 4
2 a · 3 a = 6 a 2
下列各式中计算结果为 x 6 的是 ( )
x 2 + x 4
x 8 - x 2
x 2 · x 4
x 12 ÷ x 2
3 ab - 2 ab = 1
( 3 a 2 ) 2 = 9 a 4
3 a 2 · 2 a = 6 a 2
x 7 ÷ x 5 = x 2
( x y 2 ) 2 = x y 4
x 2 · x 5 = x 10
( a + b ) ( a - b ) = b - a
a 3 - a 2 = a
a 2 · a 3 = a 6
( a 2 ) - 3 = a - 6
5 - 3 = 2
( - 2 ) 2 = - 2
a 5 ÷ a 2 = a 3
( a b 2 ) 3 = a b 6
a · a 2 = a 2
5 a · 5 b = 5 ab
a 5 ÷ a 3 = a 2
2 a + 3 b = 5 ab
a 3 · a 2 = a 6
a 7 ÷ a 3 = a 4
( - 3 a ) 2 = - 6 a 2
( a - 1 ) 2 = a 2 - 1
3 a + 2 b = 5 ab
( a 3 ) 2 = a 6
a 6 ÷ a 3 = a 2
( a + b ) 2 = a 2 + b 2
下列运算结果正确的是 ( )
3 x - 2 x = 1
x 3 ÷ x 2 = x
x 3 · x 2 = x 6
x 2 + y 2 = ( x + y ) 2
下列运算中,正确的是 ( )
2 a + 3 a = 5 a
( a - b ) 2 = a 2 - b 2
7 + 3 = 10
( a 2 ) 3 = a 5
2 a + 3 a = 6 a
下列各式中,计算正确的是 ( )
8 a - 3 b = 5 ab
a 8 ÷ a 4 = a 2
a 2 · a = a 3