Легко!
9+1=10
8-2=6
6+2=8
7-3=4
<span>6*(5-х)=-8х-7
</span>30x-5x=-8x-7
30x-5x+8x=-7
33x=-7
x=-7/33
x= -0.21212121.......
<span>-6*(2-3х)=-2х-5.
-12+18x=-2x-5
18x+2x=12-5
20x=7
x=7/20
x=0.35
</span>
1) 3*3*3+3/3 +3
2) 5*5+5+5/5
<span>3) 33-3 +3/3</span>
1) 4 - 9 = -5
2) - 5 - 2 = - 7
3) 12 - (-7) = 12 + 7 = 19
1) 0,2 + (а + 1,8) = 0,2 + а + 1,8 = а + 2
2) -(р - 5) - 7 = -р + 5 - 7 = -р - 2
3) (х + 7) - (х -1) = х + 7 - х + 1 = 8