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Decimal expression with a^2 - b^2 over c^2 + c*d: factorise to simplify

This type of question, asked 2 times: 15 Nov 2020 Tier II, 29 Jan 2022 Tier II. All 2 questions below, oldest first.

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  1. Question 1

    15 Nov 2020 Tier II

    78
    The value of 0.0203×2.920.7×0.0365×2.9÷(12.12)2−(8.12)2(0.25)2+(0.25)(19.99)\frac{0.0203 \times 2.92}{0.7 \times 0.0365 \times 2.9} \div \frac{(12.12)^2 - (8.12)^2}{(0.25)^2 + (0.25)(19.99)} is:

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  2. Question 2

    29 Jan 2022 Tier II

    79
    The value of 14+[(20.35)2−(8.35)2]×0.0175(1.05)2+(1.05)(27.65)\frac{1}{4} + \frac{[(20.35)^2 - (8.35)^2] \times 0.0175}{(1.05)^2 + (1.05)(27.65)} is:

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