WORD格式:..+-9x=-34y1=2-(1-43x)-21(2-3x)=[33(21x-41)-3]-2=-=-3(20-x)=6x-7(9-x)7.(21)[x(x1)](1)-2(2x+3)=-3(2x+1)-1=+y=+x=+6=8-3x15,4x-3(20-x)=6x-7(9-x),=1-17,=--,346x2x123x19,1233x15x720,=1-4621,2x-135x-1-6=122,43(2x)5x2x1x223,13224,x31x24x622x1xx2325,4x3(20x)326,136x132x12327,6x-7=4x-528,29,2(3y1)7(y2)330,x33x1245x6331,x-3x-4-=132,2x-5313=2x16-133,27(3x+7)=2-,2x315x1-6=1x1235,80%·x=(x+22)·75%36,44323专业资料整理WORD格式37,2x323x13238,x(78x)3(x2)3x239,(4)x2340,xx1x22322x15x141,15(75x)2x(53x)42,,y8144,,15(75x)2x(53x)2x15x146,1681147,,(1)3(x-2)=2-5(x-2)(2)2(x+3)-5(1-x)=3(x-1)(3)3(x1)2(x2)2x3(4)3(x2)1x(2x1)(5)2x-13=x+221x1+1(6)132x8(8)412(7)(9)31xx(10).
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