初一数学解方程题大集合.doc

文档介绍：+-859?x=?y-314?y=2-652?(1-23x)-31(2-4x)=[23(41x-21)-3]-2=?x-?x=-3(20-x)=6x-7(9-x)7.)12(43)]1(31[21???? 3( 1) 3 2 33 2 2xx? ?? ???? ?? ????????-2(2x+3)=-3(2x+1)?y-1=?+y=867??x+x=?+6=8-3x15,4x-3(20-x)=6x-7(9-x)16,5y-21?y=1-52?y17,?-?=?x18,321264????xx19,133221????xx20,413?x-675?x=121,2x-13-5x-16=122,xx5)2(34???23,122312????xx24,246231xxx?????25,3)20(34???xx26,1632312?????xxx27,6x-7=4x-528,132321????xx29,327132????)()(yy30,63542133?????xxx31,3 415 3x x- -- =32,2x-31=612x?-133,72(3x+7)=2-,312?x-615?x=135,80%·x=(x+22)·75%36,1 24 43 2 3x? ?? ???? ?? ?37,2 3 2 313 2x x? ?? ?38,)2(3)87(????xxx39,)4(3223???xx40,32221?????xxx41,)35(2)57(15xxx?????42,1815612????xx43,??183131?????????yy44,???xx45,)35(2)57(15xxx?????46,1815612????xx47,??183131?????????yy48,???xx(1)3(x-2)=2-5(x-2)(2)2(x+3)-5(1-x)=3(x-1)(3)3( 1) 2( 2) 2 3x x x? ????(4)3( 2) 1 (2 1)x x x? ????(5)2x-13=x+22+1(6)12131???x(7)xx???38(8)???xx(9)3 2x x? ??(10)3 1 4 212 5x x? ?? ?(11)3 1 2 5 724 3y y? ?? ?(12)5