(х+8519) - 35628 = 287394
(х + 8519) = 287394 + 35628
(х + 8519) = 323022
Х= 323022 - 8519
Х= 314503
_________
( 314503 + 8519) - 35628= 287394
287394=287394
1) =4*(-25+100)= -25*4+4*100=-100+400=300
2)=(25-100)*(-4)=-4*25-4*(-100)=100+400=300
3)=(20-125)*(-8)=-8*20-8*(-125)=-160+1000=840
4)=8*(125-30)=8*125-8*30=1000-240=760
2/3x = 1/2y
4x = 3y
x = 3/4y
x : y = 3/4 = 0,75