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81. Rationalise the denominators of the following:

fraction numerator 1 over denominator square root of 7 minus square root of 6 end fraction

124 Views

82. Rationalise the denominators of the following:

fraction numerator 1 over denominator square root of 5 plus square root of 2 end fraction

119 Views

83. Rationalise the denominators of the following:

fraction numerator 1 over denominator square root of 7 minus 2 end fraction equals fraction numerator 1 over denominator square root of 7 minus 2 end fraction cross times fraction numerator square root of 7 plus 2 over denominator square root of 7 plus 2 end fraction

128 Views

84. Identify the following as rational or irrational numbers. Give the decimal representation of rational numbers.

square root of 4

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85. Identify the following as rational or irrational numbers. Give the decimal representation of rational numbers.

3 square root of 18

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square root of 1.44 end root

square root of 1.44 end root space equals space square root of 1.2 space cross times 1.2 end root equals 1.2 equals 12 over 10 equals 6 over 5

which is a rational number.

Here p = 6
q = 5

left parenthesis not equal to 0 right parenthesis

Its decimal representation is 1.2

5 space right parenthesis space 6.0 space left parenthesis space 1.2 space space space bottom enclose space space 5 space space space end enclose space space space space space 10 space space space bottom enclose space space 10 space end enclose space space space space space space straight X

376 Views

87. Identify the following as rational or irrational numbers. Give the decimal representation of rational numbers.

square root of 9 over 27 end root

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88. Identify the following as rational or irrational numbers. Give the decimal representation of rational numbers.

negative square root of 0.64 end root

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89. Identify the following as rational or irrational numbers. Give the decimal representation of rational numbers.

square root of 100

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90. In the following equations, find which variables x, y, z etc., represent rational numbers and which represent irrational numbers:

x²= 5

972 Views