七年级上解方程50道(1)1153412xx;(2)70%x+(30-x)×55%=30×65%;(3)5(2)3(27)xx.(4)511241263xxx;(5)2(y-3)-6(2y-1)=-3(2-5y);(6)5(2)3(27)xx;(7)23x-514x=1.(8)1322242xx;(9)3(x-2)+1=x-(2x-1)(10)11432123xx.(11)37615y;(17)615x=819x-31x(12)512152xxx;(18)5(x+2)=2(2x+7);(13)14126110312xxx(19)2(x+0.5)-3(x-0.4)=5.6(14)325(2)xx;(20)3(x+2)-2(x+2)=2x+4(15)2313512xxx(21)911z+72=92z-75(16)2x+3=x-1(22)52x-103x-352x+3=0(23)2(10-0.5y)=-(1.5y+2)(29)x15400x21003(24)151423xx(30)1432312xx(25)05.035.22.04xx(31)38316.036.13.02xxx(26)511241263xxx(32)3(2x+5)=2(4x+3)-3(27)5.702.0202.05.21.0)32(2xx(33)4y﹣3(20﹣y)=6y﹣7(9﹣y)(28)4x-3(x-20)=6x-7(9-x)(34)7(2x-1)-3(4x-1)=4(3x+2)-1(35)312x=76x(41)2(x-2)-3(4x-1)=9(1-x)(36)(51)13(4-y)=14(y+3)(42)15-(8-5x)=7x+(4-3x)(37)32x=x-16x(43)3(x-7)-2[9-4(2-x)]=22(38)511241263xxx;(44)120-4(x+5)=25(39)1122(1)(1)223xxxx;(45)x+12.5=3.5x(40)22)]2(49[2)7(3yy(46)8x-22.8=1.2(47)2(x-2)+2=x+1(48)15-(8-5x)=7x+(4-3x)(49)3(x-7)-2[9-4(2-x)]=22(50)2(x-2)-3(4x-1)=9(1-x)