初一数学题哪位大侠能解答?%>_
1个回答

(1)1/2x-1/3x-2/3x+1

=六分之三x-六分之二x-六分之四x+1

=1-二分之一x

(2)3a-2b+2a+3b+a-b

=6a

(3)7m²n-3mn²+5m²n+mn²

=12m²n+2mn²

(4)(3x²+7x)+(4x²-3x-1)

=7x²+4x-1

(5)15y+4y-10y

=9y

(6)-6xy+xy+8xy

=3xy

(7)-p²-p²-p²

=-3p²

(8)m²-n+m²-n

=2m²-2n

(9)3a的四次方-5a³+2a³

=3a的四次方-3a³

(10)-2x³+3x²-2x³+2x³-x²

=-2x³+x²

我写了半天