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(本题6分)已知,,求代数式的值.
单项式与的差是 .
有理数a,b,c在数轴上的位置如图所示,则( )
(每小题6分,共12分)(1)化简: (2)先化简,再求值: ,其中,.
计算:(每题3分,共18分)(1)-20+(-14)-(-18)-13 (2)-(-28)÷(―6+4)+(―1)× ︳-5 ︳ (3) (4) (5)5m-7n-8p+5n-9m-p (6)
下列运算正确的是 ( )
( − 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
下列计算正确的是( )
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
计算: 2 a + 3 a = .
下列计算正确的是 ( )
a 2 + a 2 = 2 a 4
a 2 ⋅ a = a 3
( 3 a ) 2 = 6 a 2
a 6 + a 2 = a 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
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
先化简,再求值:3-[7x-2(6x-8)-],其中x=-1.
2(a-b)-3(a+b)
计算(1) (2)(3)(4)
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