Объяснение:
a) 42^2-32^2=(42-32)*(42+32)=10*74=740
b)9.5^2-0.5^2=(9.5-0.5)*(9.5+0.5)=9*10=90
7.5^2-2.5^2=(7.5-2.5)*(7.5+2.5)=5*10=50
90/50=1.8
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Объяснение:
a) 42^2-32^2=(42-32)*(42+32)=10*74=740
b)9.5^2-0.5^2=(9.5-0.5)*(9.5+0.5)=9*10=90
7.5^2-2.5^2=(7.5-2.5)*(7.5+2.5)=5*10=50
90/50=1.8