(40-x)(40+4x)=2400
1/4x+5+1/2【x-(1/4x+5)】-5+40=x
x除55%=100 60%x=30 x+50%x=4.5 (1-25%)x=72 4x+40%x=176 解方程
(X/80+X/100 +5)*40=X,
2x+(22-x)=40
(x+40)*80%-x=12
2*【x+(x+40)】=400
解方程:(1)16x-40=9x+16 (2)4x=20/3x+16 (3)2(3-x)=-4(x+5)
(1+1/3)x=28 (1-2/7)x=40 x-2/5x=36 x+4/7x=55 急
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
3/x-1=4/x 6/x+1=x+5/x(x+1)
20000(1+40%)=20000-x+(4x+2000)