Thanks

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Đề là chia hết cho 150 à bạn

Có \(369^3-219^3\)

\(=\left(369-219\right)\left(369^2+369.219+219^2\right)\)

\(=150\left(369^2+369.219+219^2\right)⋮150\)

\(\RightarrowĐPCM\)

\(C=\dfrac{258^2-242^2}{254^2-246^2}\)

\(C=\dfrac{\left(258+242\right)\left(258-242\right)}{\left(254+246\right)\left(254-246\right)}\)

\(C=\dfrac{500.16}{500.8}=2\)

Tik mik nha !!!

A = 258² - 242²/254² - 246²

A = (258 - 242).(258 + 242)/(254 - 246).(254 + 246)

A = 16.500/8.500

A = 2

=2 nha 

\(M=\frac{258^2-242^2}{254^2-246^2}\)

\(=\frac{\left(258-242\right)\left(258+242\right)}{\left(254-246\right)\left(254+246\right)}\)

\(=\frac{16.500}{8.500}\)

\(=2\)

p/s: chúc bạn hk tốt

\(M=\frac{258^2-242^2}{254^2-246^2}\)

\(M=\frac{\left(258-242\right)\left(258+242\right)}{\left(254-246\right)\left(254+246\right)}\)

\(M=\frac{16.500}{8.500}=\frac{16}{8}=2\)

a: \(P=3^3\left(123^3-73^3\right)\)

\(=3\cdot9\cdot\left(123-73\right)\cdot A=1350\cdot A\cdot3⋮1350\)

b: \(=4^3\left(93^4+32^4\right)\)

\(=4^3\left(93+32\right)\cdot A=125\cdot64\cdot A=8000\cdot A⋮8000\)

Vì a=b=>a-b=0=>Từ (a-b)(a+b)=b(a-b) không thể suy ra a+b=b.

Điều này chỉ đúng khi b=0

dung ~~~~~~~a+b=b

a=b-b

a=0~~~~~~~~~~~~~a luon luon =0