Explicación paso a paso:
3k+4k=20+5k
7k=20+5k
7k-5k=20
2k=20
k=10
30x40=1200
Su area mide 1200 cm2
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Explicación paso a paso:
3k+4k=20+5k
7k=20+5k
7k-5k=20
2k=20
k=10
30x40=1200
Su area mide 1200 cm2