1、解方程X X= 2X + = 70%X + 20%X = 3.627 4325 35X =20 25% + 10X = X - 15%X = 53415468X X121 5X3 X 1283 215732416X5 =13.4 3X=8341X83X = X X= 4X6 =27216874332X= X = X = 125 310 537298615X = 4x3 9 = 29 x + x = 43564213 216X 21 =4 103326X5 =13.4 X- X= 463825 13 3105X= X= X =1952185454281X =12 X= X= 3241537298
2、615X = X-0.25= =30% 3564213414X4+0.7X=102 X+ X=42 X+ X=10532141X- X=400 X-0.125X=8 = 83 X364X+ X=18 X( + )= x0.375x= 37 16 38 1312 65x + =4 X 73X12 5 X2.45832180.365- x = (x- 4.5) = 7 x- 25%x = 1034 35 23 12x- 0.8x = 16+6 20 x 8.5= 1.5 x- x -4= 4521 X25%X=90 X X= 37 89(1) +2.4=6 (2)3.5: =5:4.2 (3)1.8=2.453(4) = (5)631.8=7.2 (6)175=2.4+3 x108.52 51(7) = (8) = 83 (9)12.6 2=84x52.14165(10) = (11) =2.1x6.0553215
