help besok harus di kumpulin :( !!!!!
Jawaban:
Panjang MN 14 cm
Langkah - langkah:
Misal MN = a
[tex]\sf \: 9.8 = \frac{(a \times 3) + (7 \times 8)}{7 + 3} \\ \\ \sf \:9.8 = \frac{3a + 56}{10} \\ \\ \sf \:9.8(10) = 3a + 56 \\ \\ \sf \:98 = 3a + 56 \\ \\ \sf \: - 3a = 56 - 98 \\ \\ \sf \: - 3a = - 42 \\ \\ \sf \:a = - \frac{42}{3} \\ \\ \sf \:a = 14[/tex]
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