nanti sy jadikan jawaban yg terbaik
1.
[tex] {5}^{ - 3} \times {5}^{5} = {5}^{ - 3 + 5} \\ = {5}^{2} \\ = 25[/tex]
4.
[tex]( { {2}^{ - 5} })^{2} \times {8}^{3} \div 16 = ({ {2}^{ - 5} })^{2} \times ({ {2}^{3} })^{3} \times \frac{1}{16} \\ = {2}^{ - 5 \times 2} \times {2}^{3 \times 3} \times {2}^{ - 4} \\ = {2}^{ - 10} \times {2}^{9} \times {2}^{ - 4} \\ = {2}^{ - 10 + 9 - 4} \\ = {2}^{ - 5} \\ = \frac{1}{32} [/tex]
5. a - b = 1
-(a - b) = -(1)
-a + b = -1
b - a = -1
[tex] {(a -b })^{8} + ({ b- a})^{9} = ({1})^{8} + ({ - 1})^{9} \\ = 1 + ( - 1) \\ = 1 - 1 \\ = 0[/tex]
7.
[tex] \frac{1}{4} \sqrt{5} \times \frac{2}{5} \sqrt{5} = \frac{1 \times \sqrt{5} }{4} \times \frac{2 \times \sqrt{5} }{5} \\ = \frac{ \sqrt{5} }{4} \times \frac{2 \sqrt{5} }{5} \\ = \frac{ \sqrt{5} \times 2 \sqrt{5} }{4 \times 5} \\ = \frac{2 \times 5}{20} \\ = \frac{10}{20} \\ = \frac{1}{2} [/tex]
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