1)3/5+4/15=9/15+4/15=13/15 2)2/7+5/28=8/28+5/28=13/28 3) 3/22+6/11=3/22+12/22=15/22 4)3/4+3/20=15/20+3/20=18/20
<span>1,8(4-2*a)+0,4a-6,2 = 7,2 - 3,6a + 0,4a - 6,2 = 1 - 3,2a = 1 - 3,2*(5/3) = 1 - 16/5 * 5/3 = 1 - 16/3 = 3/3 - 16/3 = -13/3 = -4 1/3
ответ: -4 1/3</span>
T=x²-3x+8)
dt=(2x-3)dx
S(2x-3)dx/(x²-3x+8)=Sdt/t=lnt=ln(x²-3x+8)+C