1、1一、解方程。 姓名： 3X= X = X= 25% X + 15%X = 837216125 310 54=30% X = X-0.25= 50% X + X = 4X537241543.6 X =20 X - 15%X = 68 X X = X X121 534127 4383X X= X + X = 4 X+ X=20 4X6 =2874321641326X5 =13.4 4 X638 X+ = X - 0.8 X = 431816+6 24 X3 9 = 29 5X3 0.365- X = 4+0.7X=102 215734 35( X - 4.5) = 7 X 12 2(X-2.6)
2、=8 X- X=23 3241 25 13 310X( + )= X0.375 X = 20 X 8.5= 1.5 X - 25% X = 1016 38 1312 65 12X - X -4= 21 453二、简便运算。（ - ）60 36 0.65101712 15 3435（1.25-0.125）8 25 8 24( - - - ) 38 12836(12+ ) 7 1310.2 2.69972 + 27.53.7-7.53.7 + 47 61337 613 9751101- 99 + - 710 710 35 35 1637103- 2- 0.921.410.928.59 2572572.254.8+77.50.48 4.87.8+780.52 1.311.61.61.3(15 ) 4.3612.58 2.5321.25227 2728 2151.25 0.8 9.63.23 15.20.254 34 3 3 146.5-（23+46.5） 89 89 89 89 8312.89-(3.89-1.6) 73.8-1.64-13.8-5.36 15.75+3.59-0.59+14.255.48-（9.4-0.52） 12.065.072.94 30.349.7610.34
