赚现金
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
2 + 3 = 5
a 3 ⋅ a 2 = α 6
( a 3 ) 2 = a 6
a 2 - b 2 = ( a - b ) 2
x 2 ⋅ x = 2 x 2
( x y 3 ) 2 = x 2 y 6
x 6 ÷ x 3 = x 2
x 2 + x = x 3
计算 ( - a ) 2 ⋅ a 4 的结果是 ( )
a 6
- a 6
a 8
- a 8
下列计算结果正确的是( )
计算: 2 × 2 - 1 = .
下列运算中,正确的是( )
a 2 • a 5 = a 10
( a ﹣ b ) 2 = a 2 ﹣ b 2
(﹣ 3 a 3 ) 2 = 6 a 6
﹣ 3 a 2 b + 2 a 2 b =﹣ a 2 b
已知2a=m,32b=n,a,b为正整数,求23a+10b的值.
下列运算中正确的是( )
下列计算正确的是 ( )
3 mn − 2 mn = 1
( m 2 n 3 ) 2 = m 4 n 6
( − m ) 3 ⋅ m = m 4
( m + n ) 2 = m 2 + n 2
2 a + 3 a = 6 a
a 8 ÷ a 2 = a 4
( a 2 ) 3 = a 5
( x 2 ) 3 = x 5
x 2 + x 2 = x 4
x 2 ⋅ x 3 = x 5
下列运算结果正确的是 ( )
3 a - a = 2
a 2 ⋅ a 4 = a 8
( a + 2 ) ( a - 2 ) = a 2 - 4
( - a ) 2 = - a 2
下列式子正确的是 ( )
a 3 - a 2 = a
( a 2 ) 3 = a 6
a 3 ⋅ a 2 = a 6
试题篮