有理数加减混合运算题 合并同类项题 解方程题

-5+21*8/2-6-59 68/21-8-11*8+61 -2/9-7/9-56 4。6-(-3/4+1。6-4-3/4) 1/2+3+5/6-7/12 [2/3-4-1/4*(-0。4)]/1/3+2 22+(-4)+(-2)+4*3 -2*8-8*1/2+8/1/8 (2/3+1/2)/(-1/12)*(-12) (-28)/(-6+4)+(-1) 2/(-2)+0/7-(-8)*(-2) (1/4-5/6+1/3+2/3)/1/2 18-6/(-3)*(-2) (5+3/8*8/30/(-2)-3 (-84)/2*(-3)/(-6) 1/2*(-4/15)/2/3 -3x+2y-5x-7y祝天天快乐!