(1)7x-12=9x+4
x=(ア)
3
2
1
(2)-
x+
-x+
3
4
x=(イ)
(3) 0.6x-0.5 -0.2x+0.3
x=(ウ)
Jy=3x-1
(4)
(2x+y=9
x=(x), y=(+)
(3x-2y=3
(5)
15x+4y=- -17
x=(カ), y=(キ)
(0.6x+0.5y=2
(6)1 1
2x-3-6
c = ( ), y=(=)
x=
(7)x2-12-0
x= ±(#)√(¾)
(8) 3x2 15x = 0
x=0, (x)
(9)x23x-10=0
x=-(t), ()