1) a(3a2 – 4b)+b(4a-a2)
2)c(c4-c3+c2)-(c4-c3+c2)
3)19-2(5x+4)=10

1) a(3a²-4b)+b(4a-a²)3а³-4ab+4ab-a²b3a³-a²b2) c(c⁴-c³+c²)-(c⁴-c³+c²) (c⁴-c³+c²)×(c-1)c²(c²-c+1)(c-1)3) 19-2(5x+4)=1019-10x-8=1011-10x=10-10x=10-11-10x=-1|÷(-10)x=1/10

1)3a³-4ab+4ab-a²b=3a³-a²b

2)c5-c⁴+c³-c⁴+c³-c²=c5-2c⁴+2c³-c²

3)19-10x-8=10

8-10x=10

-10x=10-8

-10x=2

x=2/-10

x=-1/5

(2/-10;-1/5)-дробь