化简下列各式:(1)8x-(-3x-5) (2)(3x-1)-(2-5x) (3)(-4y+3)-(-5y-2) (4)3x+1-2(4-x)
问题描述:
化简下列各式:(1)8x-(-3x-5) (2)(3x-1)-(2-5x) (3)(-4y+3)-(-5y-2) (4)3x+1-2(4-x)
答
(1)原式=8x+3x+5
=11x+5
(2) 原式=3x-1-2+5x
=8x-3
(3) 原式=-4y+3+5y+2
=5+y
(4 ) 原式=3x+1-8+2x
=5x-7