第1个回答 2012-06-03
56x0.18+18%x44=56x0.18+0.18x44=(56+44)x0.18=100x0.18=18
x-60%x=18 x-0.6x=18 x(1-0.6)=18 0.4x=18 x=45
(3/5)x+2.5x8=95 (3/5)x+2.5x4x2=95 (3/5)x+10x2=95 (3/5)x+20=95 (3/5)x=75 x=125
40%x+30=80 40%x=50 0.4x=50 x=125
35%x-20%x=30 (35%-20%)x=30 15%x=30 0.15x=30 15x=3000 x=200