4a + 90a = a (90 + 4) = 94a
86b - 77b = b (86-77) = 9b
209m + m = m (209+1) = 210m
302n - n = n (302-1) = 301 n
4m^2+2mx-2mx-x^2+x^2
4m^2
2m
<span> один процент рубля это одна копейка</span>
((32/57 + 27/38) * 19/29 + (25/26 + 48/65) * 10/51 + (74/75 + 49/50) * 15/59) * 3/5 =
= ((145/114) * 19/29 + (25/26 + 48/65) * 10/51 + (74/75 + 49/50) * 15/59) * 3/5 =
= ((145/114) * 19/29 + (17/10) * 10/51 + (74/75 + 49/50) * 15/59) * 3/5 =
= ((145/114) * 19/29 + (17/10) * 10/51 + (59/30) * 15/59) * 3/5 =
= (5/6 + (17/10) * 10/51 + (59/30) * 15/59) * 3/5 =
= (5/6 + 1/3 + (59/30) * 15/59) * 3/5 = (5/6 + 1/3 + 1/2) * 3/5 =
= (5/3) * 3/5 = 1
А) -100-180-125= -405
б) -100-180+125= -155
в) -100+180-125= -45
г) 100-180-125= -205