1..-8x(-2)^4-(-1/2)^2x(-2)^4+4/9x(-3)^2
=-128-1/4*16+4/81
=-128-4+4/81
=-132+4/81=-131又77/81
2 -28/3
3 -21/16
4 x=-5/18
5(1)x+2x+3x=54
6x=54
x=9
x=9,y=18,z=27
-128
-28/3
-21/16
x=-5/18
(1)x=9,y=18,z=27.(2)x=7/8,y=7/4
(1)-8*16-1/4*16+4/9*9=-128-4+4=-128
(2)-28/3
(3) -21/16
(4) x=-5/18
(5)(1)x=9,y=18,z=27.(2)x=7/8,y=7/4
1 -128
2 -28/3
3 -21/16
4 x=-5/18
5(1)x=9,y=18,z=27.(2)x=7/8,y=7/4
1 2题你直接用电脑上的计算器不就搞定啦 开始-运行-输入calc