下列计算正确的是 ( )
a 6 + a 6 = a 12
a 6 × a 2 = a 8
a 6 ÷ a 2 = a 3
( a 6 ) 2 = a 8
a 3 + a 2 = a 5
a 3 · a 2 = a 6
( a 2 ) 3 = a 5
a 6 ÷ a 2 = a 4
计算 a 6 ÷ a 3 ,正确的结果是 ( )
2
3 a
a 2
a 3
计算 a 5 ÷ a 3 结果正确的是 ( )
a
a 4
计算 x 6 ÷ x 2 正确的是 ( )
3
x 3
x 4
x 8
a 2 · a = a 2
a 2 b - 2 b a 2 = - a 2 b
( - 3 2 a ) 3 = - 9 8 a 3
2 a × 3 a = 5 a
( - 2 a ) 3 = - 6 a 3
6 a ÷ 2 a = 3 a
( - a 3 ) 2 = a 6
a 2 + a 3 = a 5
a 2 · a 3 = a 6
a 3 ÷ a 2 = a
下列运算正确的是 ( )
( - 3 2 ) 2 = - 9 4
( 3 a 2 ) 3 = 9 a 6
5 - 3 ÷ 5 - 5 = 1 25
8 - 50 = - 3 2
下列计算结果为 a 6 的是 ( )
a 2 · a 3
a 12 ÷ a 2
( a 2 ) 3
( - a 2 ) 3
墨迹覆盖了等式" x 3 x = x 2 ( x ≠ 0 ) "中的运算符号,则覆盖的是 ( )
+
-
×
÷
计算 a 10 ÷ a 2 ( a ≠ 0 ) 的结果是 ( )
a 5
a - 5
a 8
a - 8
下列计算中,正确的是( )
若3x="18," 3y=6,则3x-y=( )