Decimals and Fractions Practice Test 1

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Question : 34 of 40

Marks: +1, -0

Evaluate:

{(0.47)^3-(0.2)^3}/{(0.47)^2+0.188+(0.2)^2}

0.213
0.123
0.47
21.3
0.0213

Solution:

{(0.47)^3-(0.2)^3}/{(0.47)^2+0.188+(0.2)^2}

={(0.47-0.2)[(0.47)^2+(0.2)^2+(0.47)(0.2)]}/(0.47+0.2)^2

={0.27 (0.2209+ 0.04 +0.094)}/(0.67)^2

=0.27(0.3549/0.4489)

= 0.27× 0.79 = 0.213

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