Question

$(4 {?}^{2} { - 3}^{2} ) \div (1 \div 7) {?}^{2}$
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Answer 1

Answer:

(4^2-3^2)=16-9=7

and (1/7)^2=1/49

therefore, (4^2-3^2) ÷ 1/7^2=7/1/49= 7×49=343