3-2-7к=-4/19
1-7к= -4/19
-7к= -4/19 - 1
-7к=-23/19
к = 23/(19*7)
к= 23/133
X^3+2(x^2 *y)-x*y^3+x*y^2-y^4 ( ^ ---Знак степе ни)
<span> (44,96+28,84/(13,7-10,9))/1,8= 30,7
13,7-10,9=2,8
28,84:2,8=10,3
44,96+10,3=55,26
55,26:1,8=30,7
</span>
1/3х + 1/7у - 1/7х +1/2у =
= 1/3х - 1/7х +1/7у + 1/2у =
= 7/21х - 3/21х 2/14у + 7/14 у =
= 4/21х + 9/17у
А+4+3а+12=4а+16
m×8×n×9=72mn
16x-7x-2x=7x