Jawaban:
jawaban dan caranya terdapat pada gambar
1
[tex]4 \times ( - 5) + 7 = - 20 + 7 = - 13 \\ [/tex]
2
[tex] \frac{2}{3} + \frac{4}{7} \times \frac{2}{14} = \frac{2}{7} + ( \frac{4}{7} \times \frac{2}{14} ) \\ = \frac{2}{7} + \frac{4}{49} \\ = \frac{14 + 4}{49} \\ = \frac{18}{49} [/tex]
3
[tex]2 \frac{1}{3} \div 4 \frac{2}{5} = \frac{7}{3} \times \frac{5}{22} \\ = \frac{35}{66} [/tex]
4
[tex]4 \frac{3}{7} + 5 \frac{2}{8} - 2 \frac{1}{4} = \frac{31}{7} + \frac{42}{8} - \frac{9}{4} \\ = \frac{31}{7} + \frac{21}{4} - \frac{9}{4} \\ = \frac{124 + 21 - 9}{28} \\ = \frac{136}{28} \\ = \frac{34}{7} \\ = 4 \frac{6}{7} [/tex]
5
[tex]18 = 2 \times 3 {}^{2} \\ 72 = 2 {}^{3} \times 3 {}^{2} \\ fpb = 2 \times 3 {}^{2} = 2 \times 9 = 18[/tex]
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