Question

ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО ПРОШУ

Answer 1

-{x-y=5
-{x+2y=-1
-3y=6|:(-3)
y=-2
x+2=5
x=3

(-0,2m³np⁴)²*25mn³p=0,04m6n²p8*25mn³p=
m7n5p9

(14ab-9a²-3b²)-(-3a²+5ab-4b²)=
14ab-9a²-3b²+3a²-5ab+4b²=-6a²+b²+9ab

Answer 2

$9); ; left { {{x-y=5} atop {x+2y=-1}} right.ominus left { {{x=5+y} atop {-3y=6}} right. left { {{x=3} atop {y=-2}} right.; ; Rightarrow; ; ; (3,-2)\\10); ; (-0,2m^3np^4)^2cdot 25mn^3p=0,04m^6n^2p^8cdot 25mn^3p=m^7n^5p^9\\(14ab-9a^2-3b^2)-(-3a^2+5ab-4b^2)=\=14ab-9a^2-3b^2+3a^2-5ab+4b^2=9ab-6a^2+b^2$