December 2018 1 9 Report
Rozwiąż układy równań.
a)
320x=240y
y=x+0,6

b)
2x+2y=54
 \frac{x}{y} = \frac{4}{5}

c)
12x+24y=168
-12x-12y=-100,8

d) v= \frac{s}{t}
v-20=\frac{x}{z}
v=\frac{300-x}{2} }
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