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(2)70%x+(30-x)×
55%=30×
65%;
(3)
.(4)
(5)2(y-3)-6(2y-1)=-3(2-5y);
(6)
(7)
-
=1.(8)
(9)3(x-2)+1=x-(2x-1)(10)
.
(11)
(17)
=
(12)
(18)5(x+2)=2(2x+7);
(26)
(32)3(2x+5)=2(4x+3)-3
(27)
(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)
(41)2(x-2)-3(4x-1)=9(1-x)
(36)(51)
(4-y)=
(y+3)(42)15-(8-5x)=7x+(4-3x)
(37)
=x-
(43)3(x-7)-2[9-4(2-x)]=22
(38)
(44)120-4(x+5)=25
(39)
(45)x+12.5=3.5x
(40)
(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)