Đáp án:
Giải thích các bước giải:
1)x-140:35=270 2)(x-140):35=270 3)(x+40)x15=75x12 4)x:15+42=15+25x8
x=x-4=270 x=270x35 =(x+40)x15=900 x:15+42=15+200
x=270+4 x=9450+140 x=900:15 x:15+42=215
x=274 x=9590 x=60-40 x=215-42
x=20 x=173x15
x=2595
5)x-4300-(5250:1050x250)=4250 6)x-6:2-(48-24x2:6-3)=0
x-4300-(5x250)=4250 x-6:2-(48-48:6-3)=0
x-4300-1250=4250 x-6:2-(48-6-3)=0
x=4250+1250+4300 x-6:2-39
x=9800 x-3-39
x=39+3
x=42
7)x+5x2-(32+16x3:6-15)=0 8)460+85x4=(x+200):4
x+10-(32+48:6-15)=0 460+340=(x-200):4
x+10-(32+8-15) =800=(x-200):4
x+10-25=0 =800x4
x=0+25-10 =3200+200
x=15 =3400
9)x x2009=2009x2010 10)(x x0,25+2009)x2010=(53+2009)x2010
x=2010 x=53-0,25
x=52,75
