赚现金
下列计算正确的是 ( )
3 a + 2 b = 5 ab
( − 2 a ) 2 = − 4 a 2
( a + 1 ) 2 = a 2 + 2 a + 1
a 3 · a 4 = a 12
下列用科学记数法表示200 000,正确的是( )
下列运算正确的是 ( )
x 2 + x 3 = x 5
( x - y ) 2 = x 2 - y 2
( x 2 ) 3 = x 6
x 6 ÷ x 3 = x 2
下列各组数中: ①﹣52和(﹣5)2; ②(﹣3)3和﹣33; ③﹣(﹣0.3)5和0.35; ④0100和0200; ⑤(﹣1)3和﹣(﹣1)2.相等的共有( )
a + a 2 = a 3
( 2 a 2 ) 3 = 2 a 6
a 6 ÷ a 2 = a 3
a 3 ⋅ a 2 = a 5
数据1600万用科学记数法表示为( )
下列式子正确的是 ( )
a 3 - a 2 = a
( a 2 ) 3 = a 6
a 3 ⋅ a 2 = a 6
( a 2 ) 3 = a 5
在﹣22,(﹣2)2,﹣(﹣2),﹣|﹣2|中,负数的个数是( )
( − 3 a 2 ) 3 = − 9 a 6
( − a ) 2 ⋅ a 3 = a 5
( 2 x − y ) 2 = 4 x 2 − y 2
a 2 + 4 a 2 = 5 a 4
a 2 + a 2 = a 4
( a 3 ) 2 = a 5
a 3 a 2 = a ( a ≠ 0 )
下列运算中,正确的是 ( )
a 2 + a = a 3
( - ab ) 2 = - a b 2
a 5 ÷ a 2 = a 3
a 5 ⋅ a 2 = a 10
2 x 2 + 3 x 2 = 5 x 2
x 2 ⋅ x 4 = x 8
x 6 ÷ x 2 = x 3
( x y 2 ) 2 = x y 4
3 x 2 - 2 x = x
( - 2 x ) 3 = - 6 x 3
2 x 2 + 3 x 3 = 5 x 5
( − 2 x ) 3 = − 6 x 3
( x + y ) 2 = x 2 + y 2
( 3 x + 2 ) ( 2 − 3 x ) = 4 − 9 x 2
x 3 + x 3 = x 6
2 x 3 - x 3 = x 3
( x 3 ) 2 = x 5
x 3 ⋅ x 3 = x 9
试题篮