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Romashka-Z-Leto [24]
4 years ago
15

0.4(20-10m)+ 2.5-2m-12.5

Mathematics
1 answer:
posledela4 years ago
5 0

Answer:

-2-6m

Step-by-step explanation:

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megagrams to kilograms

1 megagram = 1000 kilograms

hectoliter to deciliter

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HELLPP!!!!!!!!!!!!!!!!!!!!!!!!!
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\left\{\begin{array}{ccc}2x-3y=-27&|\cdot3\\-3x+2y=23&|\cdot2\end{array}\right\\\underline{\left\{\begin{array}{ccc}6x-9y=-81\\-6x+4y=46\end{array}\right}\ \ \ \ |\text{add both sides}\\.\ \ \ \ \ \ -5y=-35\ \ \ \ \ |:(-5)\\.\ \ \ \ \ \ \ \ y=7\\\\\text{put the value of y to the first equation}\\\\2x-3(7)=-27\\\\2x-21=-27\ \ \ \ |+21\\\\2x=-6\ \ \ \ |:2\\\\x=-3\\\\\text{Answer:}\ x=-3,\ y=7\to\boxed{(-3,\ 7)}

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