Evalute:[4²-3²]÷(1/7)²
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-12²×7²
-72²
mere hisab se ye h ans Hona chaheye
aur 72 Ka ² hone me bad sign plus hoga
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4²-3² =16-9 =7
(1/7)² =1/49
7÷1/49 =7×49 =343 =7³
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