一元一次方程50道练习题含答案1.doc

兀一次方程(1)；(2)(3)(4)(5)(6)(7)5x+2=7x-8; (8);(19)0,4.1+05 O.Ijs-0.5 0.03 + 0+02i 2(2—1) . . 0.2-20x ■ =. — 2,5 = 0.5 0.2 0.03 (10 0,01 … 丄 25—1 7(11) ；7 | 勺(12)-(13) 1 ;(15)7(⑹ ；5 1 27 X- 12{— -T -—)二 8 — -(6a — 9) (17) -2 - 18 AT A(18) ' ;2 (x+ I}耳 30% + (1加-1)x25% = - a52-3.t(20) 25 + x =«3 」I _—*I1 ；———X- 1+ 3 I + 5r I(21 6|4 3^2 JL ■J j(22)2(2x-1-4(4x-1-5(2x+1-19=03.y- 1 . 3x^5 x+ 1 = --4 】—-2-(23)346 20.4 a+0.9O.Ia-0.5山03 + 0+02 J(24)0.50.2-0.033 2 i i 2 ¥T-H+2 卜 2 ————(25)(26) 2{3[4(5x-1-8]-20}-7=1(272(0.3x-4-5(0.2x+3=9(282[(x+3-2(x+1]-5=02X+3)(293x-16x-3(30 i(323x=2x+5(332y+3=y — 1(347y=4—3y(3610x+7=12x— 5 — 3x(378x — 4+2x= 4x —3(38. 2 (3x+4) =6-5 (x-7)-(a- 5)+ = (42) ' ' -41-1.5 5x- O.R L2- x .■ = * + 3(43) :- ' :I-A X+ 2(44. x- = -10,4 y+ 0.9 y-5 03 + 0+2yr rir 才(45. ■- =I(46 3 (x+2) - (2x-3=2(2x-3-I(x+2(47.(4 &{ [ ( x-2-2]}-2=0(49、5( y+ 8— 5 = 4( 2y—7 ;L8-8x 1.3-3a 5a- 0.4L2 2 0.3(1) x =2;( 2) x =—2;( 3) x =7;( 4) x =1;(5) x =—5；(6) x = ;( 7)2x = - ；( 8) xI=-.7v —1(9)x=5;(10);(11)x=3;(12)■.6 r= 一x -=-7-(13)x=0;(14)x=6;(15)_ ;(16)4 .832253050616X ―:——x=-x = =A = 一17.9 18.51935_ 20 '■')821. x=8 22.x=-1 23.x=-3 24.x=9 25.x=3 £26.x=1 27、x=-80 28、x=- 29、30、24.96 31、x=12 5 丄32x=5 33y= — 4 34y= 35y=— 36x=— 12 37x=7 17 2— — x=—38.x=3 39.x二 40.x= | 41.(42) ' =6 ; (43) . = — 2 ;244. _ 45. '46. 47. x=186I 148、y = 21 49、x= ; 50、x=丨;(50、。