(1)7x-(-2x+1)-(8x-1),其中x=-2
=7x+2x-1-8x+1
=x
=-2;
(2)(3x-5y)+(-3x+y),其中x=5,y=3
=3x-5y-3x+y
=-4y
=-4×3
=-12;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,
(1)7x-(-2x+1)-(8x-1),其中x=-2
=7x+2x-1-8x+1
=x
=-2;
(2)(3x-5y)+(-3x+y),其中x=5,y=3
=3x-5y-3x+y
=-4y
=-4×3
=-12;
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,