99 999 999 999
9+9+9+9+9+9+9+9+9+9+9 = 9*11 = 99
9*11 + 1 = 99 + 1 = 100
1) 16m-15m=-10+5
M=-5
2)-5n+4n=10+8
-n=18
3)3y=3-18
3y=-15
Y=5
4)-12x+11x=20-40
-x=-20
1)2×9=18
2)16-7=9
3)18÷3=6
4)81÷9=9
5)8×7=56
6)56+6=62
7)62-9=53
<span> -9(3х-8у)+4(11 х-2у)= -18x+18y+44x-8y=44x-8y=44*(-1.3)-8*2.2=57.2-17.6=39.6</span>