कक्षा नौवीं की गणित में 2.5 के सवाल sarvsamika wali
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sarvsamika I. (a+b)²=a²+2ab+b²
sarvsamika II. (a-b)²=a²-2ab+b²
sarvsamika III. a²- b²=(a+b)(a-b)
sarvsamika IV. (x+a)(x+b)=x²+(a+b)x+ab
sarvsamika V. (x+y+z)²=x²+y²+z²+2xy+2yz+2zx
sarvsamika VI. (a+b)³=a³-b³-3ab(a-b)
sarvsamika VII. (a-b)³=a³-b³-3ab(a-b)
=a³-3a²b+3ab²-b³
sarvsamikaVIII. a³+b³+c³-3abc=(a+b+c)(a²+b²+c²- ab-bc-ac)
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