2、解方程 72513 + X = 1 X— = X+ = 979 X - 29 = 16 2X + 7X = 4.5 3X - 2 = 4 X - （1153 + 4） = 12 3X+ 4X= 5.67 138319 82 33710＋x=5 x－15=15 x―110―25=25 3x－167=57 2x x+13＝25 x-31124＝12 7 +x=3 9571214 419－x=18 ＋16=116 1312x-9x=8.7 9x-4x=6.5 x- = 68 337141＋x= x－= －x= 105 x―110―225=5 3x 5Ｘ－2Ｘ＝18 x — 516 = 9 2x + 1 = 5 3 x －x = 0.9 x — 56 = 19 2x + 1 = 5 13a-5a=3 155918－1617=57 2x＋6=116 35＋Ｘ＝710 Ｘ－314＝12 152 + x = 6 12x — 9x = 8.7 3x — x = 0.9 x — 314 = 12 x －415 = 45 524 ＋ x = 1112 12x — 9x = 8.7 3x — x = 0.9 x + 239 = 5 3x+ 4x= 5.67 12 + x = 56 本文来源：https://www.wddqw.com/doc/e8857779852458fb770b568c.html