using a^2-b^2=(a+b) (a-b) (a).(1.01)^2 -(0.98)^2 (b). (12.1)^2-(7.9)^2
Jessica990:
Is it (1.01)² or (1.02)²??
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b=(12.1+7.9)(12.1-7.9)
=20×4.8
=96
=20×4.8
=96
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