(4) (5); (6)
B组(1)7(2x-1)-3(4x-1)=4(3x+2)-1; (2)3(20-y)=6y-4(y-11) (3)2(x-2)-3(4x-1)=9(1-x)
(4) (5) (6)
C组(1)15-(8-5x)=7x+(4-3x) (2)3(x-7)-2[9-4(2-x)]=22 (3)(x-2)-2(4x-1)=3 (1-x).
(4) (5) (6)
(17) 18x+3x-3=18-2(2x-1)
(26);(27); (28)[;
(29) (30) (31)
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