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下列计算正确的是 ( )
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
下列运算正确的是 ( )
a 3 - a 2 = a
a 2 · a 3 = a 6
a 6 ÷ a 2 = a 3
( a 2 ) - 3 = a - 6
有一列数,按一定规律排列成1,,4,,16,,,其中某三个相邻数的积是,则这三个数的和是 .
x - 1 3 x = 2 3
a 3 · ( - a 2 ) = - a 6
( 5 - 1 ) ( 5 + 1 ) = 4
- ( a 2 ) 2 = a 4
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
a 2 + a 3 = a 5
( a + b ) 2 = a 2 + b 2
( a 3 ) 2 = a 6
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
a 6 ÷ a 3 = a 2
( a 2 ) 3 = a 5
2 a + 3 a = 6 a
2 a · 3 a = 6 a 2
( - 2 ) 3 = 8
( a 2 ) 3 = a 6
4 x 2 - 2 x = 2 x
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
( x 2 ) 3 = x 5
2 + 8 = 10
x · x 2 · x 4 = x 6
2 2 = 2
若,,则 .
a 6 ÷ a 3 = a 3
a 4 · a 2 = a 8
( 2 a 2 ) 3 = 6 a 6
a 2 + a 2 = a 4
a 6 + a 6 = 2 a 12
2 - 2 ÷ 2 0 × 2 3 = 32
( - 1 2 a b 2 ) · ( - 2 a 2 b ) 3 = a 3 b 3
a 3 · ( - a ) 5 · a 12 = - a 20
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