. Express in power notation
(-2/7)^-3 ×(-2/7)^-3 ×(-2/7)^-3
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7+22+2×5+42+3
Rationalising the denominator, we get
=7+222×7−27−2×5+22+3×5−25−2
=49−222(7−2)×5−4(2+
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