60: 2+250:5+70x7+90= 9 80x8+20x4+3x 80-60=
7 280:70+9x90+4x40=
0 6x60-(6x90-270:3):5=
20x9+240: 80 - 160:40 =
) 4x90-2x 20+80x6+70=
720: 8+80x5-560: 80 =
40x7+450:90-240:30=
20 x 6+30x9+2x30-40=
360:90+3x70-140:2=
9x20-(7x20-240:8)=
4x90-40:20-450:90= помгмте