Answer:
14-15.
4a/5b × 15b/18a
4/5b × 15b/18
4/5 × 15/18
4/5÷5 × 15÷5/18
4÷2 × 3/18÷2
2 × 3/9
6/9 ÷ 3/3
16-17.
2x/y × x/4
2÷2x/y × x/4÷2
x/y × x/2
18-20.
x - 5/x² - 7x + 10 × x² + x - 6/5
x - 5/x² - 2x - 5x + 10 × x² + x - 6/5
x - 5/x² - 2x - 5x + 10 × x² + 3x - 2x - 6/5
x - 5/x × (x - 2) - 5(x - 2) × x × (x + 3) -2(x + 3) /5
x - 5/(x - 2) × (x - 5) × (x + 3) × (x - 2)/5
1/x - 2 × (x + 3) × (x - 2)/5
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Answers & Comments
Answer:
14-15.
4a/5b × 15b/18a
4/5b × 15b/18
4/5 × 15/18
4/5÷5 × 15÷5/18
4÷2 × 3/18÷2
2 × 3/9
6/9 ÷ 3/3
= 2/3
16-17.
2x/y × x/4
2÷2x/y × x/4÷2
x/y × x/2
= x²/2y
18-20.
x - 5/x² - 7x + 10 × x² + x - 6/5
x - 5/x² - 2x - 5x + 10 × x² + x - 6/5
x - 5/x² - 2x - 5x + 10 × x² + 3x - 2x - 6/5
x - 5/x × (x - 2) - 5(x - 2) × x × (x + 3) -2(x + 3) /5
x - 5/(x - 2) × (x - 5) × (x + 3) × (x - 2)/5
1/x - 2 × (x + 3) × (x - 2)/5
= x + 3/5