x(1+0.3)*80=104

x(1+0.3)*80=104 0.8*(100-x)+(1+10%)x=100*(1+4%) 0.8*(100-x)+(1+10%)x=100*(1+4%)80-0.8x+1.1x=104（这一步80-0.8x 我不太懂）0.3x=24（0.3X怎么算的?）x=80 1/x(x-1)+1/(x-1)(x-2)+1/(x-3)(x-4)(其中x=104) X(X-1)=X (x+1)/0.3-2x=(0.1x+0.2)/0.05 (x-0.6)/0.4+x=(0.1x+1)/0.3 (x-0.6)/0.4-x=(0.1x+1)/0.3 0.3(x+1)+0.25(100-x)=2/5x 80%X*(1+50%)=10+X 求X是多少? x-1/4x+8=80%x 2x-8.2=1-0.3x 0.3x+0.4=0.7x-1 x-1/4x=0.3 x-2-2-x/2=x-2/3 x-0.6/0.4+x=0.1x+1/0.3 160乘25%-1.3x=17.9 x/5-x/6=0.4 3(x+2)=40+11 0.3/0.5=x+1/2x-1 2.5/（x—0.5）=25% 1/3:0.25=80%：x160乘25%-1.3x=17.9x/5-x/6=0.43(x+2)=40+110.3/0.5=x+1/2x-12.5/（x—0.5）=25%1/3:0.25=80%：x 0.52x-(1-0.52)x=80 0.52x-(1-0.52)x=80 1/4x+8=80%x