\(25+\left(x-5\right)=-13-\left(15-123\right)\\ 25+x-5=-13-\left(-108\right)\\ 20+x=95\\ x=95-20=75\)

Trong hình có 4 tam giác bằng nhau là MRQ; RNS; STO; QPT nhé!

Chúc bạn học tốt!

\(B=\dfrac{2^{50}.6^{10}.9^9}{12^{30}}=\dfrac{2^{50}.2^{10}.3^{10}.3^{27}}{3^{30}.\left(2^2\right)^{30}}=\dfrac{2^{60}.3^{37}}{3^{30}.2^{60}}=3^7=2187\)

\(\dfrac{2^{50}.6^{10}.9^9}{12}=\dfrac{2^{50}.3^{10}.2^{10}.3^{27}}{12}=\dfrac{2^{60}.3^{37}}{3.2^2}=2^{48}.3^{36}\)