Question

最好有答案的,要有格式的!

Answer 1

X+9=10 y=56-4 3y-4=y+3 0.4x-3=0.1x+2

X=10-9 =52 =3.5 =-2

x=1

5x+15-2x-2=10 (5y+1)+ (1-y)= (9y+1)+ (1-3y)

x=-1

20%+(1-20%)(320-x)=320×40% 3.14×720=100x.

11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x)