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下列计算正确的是 ( )
a 2 + a 3 = a 5
a 2 · a 3 = a 6
( a 2 ) 3 = a 6
( - 2 a 2 ) 3 = - 6 a 6
下列运算正确的是 ( )
a 3 · a 2 = a 6
( a 3 ) 2 = a 5
2 a 3 ÷ a 2 = 2 a
2 x + 3 x = 5 x 2
下列计算结果正确的是 ( )
a 2 + a 2 = a 4
( a + 1 ) 2 = a 2 + 1
a · a = a 2
)下列运算正确的是 ( )
( a 2 ) 3 = a 5
( 2 a ) 2 = 2 a 2
a 3 ÷ a 2 = a
下列各式中,计算结果为 m 6 的是 ( )
m 2 · m 3
m 3 + m 3
m 12 ÷ m 2
( m 2 ) 3
m 2 · m 3 = m 6
m 8 ÷ m 4 = m 2
3 m + 2 n = 5 mn
( m 3 ) 2 = m 6
下列选项错误的是 ( )
cos 60 ° = 1 2
a 2 · a 3 = a 5
1 2 = 2 2
2 ( x - 2 y ) = 2 x - 2 y
a 3 ÷ a = a 3
( a 2 b ) 2 = a 4 b 2
2 x + 3 y = 5 xy
( x + 1 ) ( x - 2 ) = x 2 - x - 2
( a - 2 ) 2 = a 2 - 4
a · a 3 = a 4
2 a - a = 2
( a 2 ) 5 = a 7
( - 3 b ) 2 = 6 b 2
下列运算结果正确的是 ( )
( - a ) 3 = a 3
a 9 ÷ a 3 = a 3
a + 2 a = 3 a
a · a 2 = a 2
a 2 b + 2 a b 2 = 3 a 3 b 3
a 6 ÷ a 3 = a 2
a 6 · a 3 = a 9
下列运算中正确的是 ( )
( 1 2 ) - 1 = - 2
( 2 - 5 ) 0 = 1
a 3 · a 3 = 2 a 6
a 6 ÷ a 2 = a 4
( 2 ab ) 3 = 6 a 3 b 3
下列各式中,计算正确的是 ( )
a 3 + a 2 = a 5
a 3 - a 2 = a
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