这2题怎么做？高分悬赏

X=10
0.25*75-2.5+250*0.035
=0.25*(75-10+35)
=0.25*100
=25

1:
26=2.6x
x=10

2:
=2.5*7.5-2.5+2.5*3.5
=2.5*(7.5-1+3.5)
=2.5*10
=25

1.
2.7x+14.6=5.3x-11.4
2.6x=26 x=10

2.
0.25*25*3-0.1*25+25*10*0.035=25*(0.25*3-0.1+10*0.035)=25*(0.75-0.1+0.35)=25*1=25

1、2.7x+14.6-5.3x+11.4=0
得x=10

2、原式＝1/4*75-1/4*10+1/4*35=1/4*100=25