1.95
2.代入得,f=59
3.(1)12(2-3)=4x+4 -12=4x+4 4x=-12-4 4x=-16 x=-4
(2)6-3(x+2/3)=2/3 6-3x-2=2/3 3x=2/3+2-6 3x=10/3 x=10/9
(3)2(200-15x) =70+25x 400-30x=70+25x 55x=330 x=6
(4) 3(2x+1)=12 6x+3=12 6x=9 x=3/2
1.95
2.代入得,f=59
3.(1)12(2-3)=4x+4 -12=4x+4 4x=-12-4 4x=-16 x=-4
(2)6-3(x+2/3)=2/3 6-3x-2=2/3 3x=2/3+2-6 3x=10/3 x=10/9
(3)2(200-15x) =70+25x 400-30x=70+25x 55x=330 x=6
(4) 3(2x+1)=12 6x+3=12 6x=9 x=3/2