У выражение. −(8,9y+13x)−(−11y−4x) = = x + y.

4,8+х+3,9-х+у-4 4/5-5 1/30=8,7+y-24/5-151/30=y+8,7+144/30-151/30=y+8,7-7/30=y+ 8 7/10-7/30=y+87/10-7/30=y+261/30-7/30=y+254/30=y+8 14/30

y=1 1/3

1 1/3+254/30=4/3+254/30=40/30+254/20=294/30=9,8

Объяснение: сорян не то

=0.5*0.02+1/6*12=0.01+2=2.01

65 - 100%

26 - x

x=100*26/65=40%