Bài 1: Tìm số đối.

- Số đối của \(\dfrac{1}{2}\) là \(-\dfrac{1}{2}\)

- Số đối của \(-\dfrac{3}{4}\) là \(\dfrac{3}{4}\)

- Số đối của \(\dfrac{7}{-12}\) là \(\dfrac{7}{12}\)

Bài 2: Thu gọn:

\(\dfrac{2^4.3^3-2^4.3^3}{2^5.3^4-2^6.3^3}=\dfrac{0}{2^5.3^4-2^6.3^3}=0\)

xin lỗi mk ghi sai đề

\(A=\dfrac{2^4.3^3+2^3.3^4}{2^5.3^4-2^6.3^3}=\dfrac{2^3.3^3.\left(2+3\right)}{2^5.3^3.\left(3-2\right)}=\dfrac{2^3.3^3.5}{2^5.3^3.1}\)

\(=\dfrac{5}{2^2}=\dfrac{5}{4}\)

Cái tên đặc sắc quá ha! :))

mik bít hết mấy người này luôn

Ta có:
\(A=\dfrac{2^3.3^3.\left(2+3\right)}{2^4.3^3.\left(2-1\right)}=\dfrac{5}{2.1}=\dfrac{5}{2}\)

Giải:

Ta có: \(A=\dfrac{2^4.3^3+2^3.3^4}{2^5.3^3-2^4.3^3}.\)

\(=\dfrac{2^4.3^3+2^3.3^3.3}{2^5.3^3-2^4.3^3}.\)

\(=\dfrac{3^3\left(2^4+2^3.3\right)}{3^3\left(2^5-2^4\right)}.\)

\(=\dfrac{16+24}{32-16}\).

\(=\dfrac{40}{16}=\dfrac{5}{2}.\)

Vậy \(A=\dfrac{5}{2}.\)

CHÚC BN HỌC GIỎI!!! ^ - ^

Đừng quên bình luận nếu bài mik sai nhé!!!

Còn nếu bài mik đúng thì nhớ tick mik để mik lấy SP nha!!!

\(A=\frac{2^4.3^3+2^3.3^4}{2^5.3^3-2^4.3^2}\)

\(A=\frac{2^3.3^3\left(2+3\right)}{2^4.3^2\left(2.3-1\right)}\)

\(A=\frac{2^3.3^3.5}{2^4.3^2.5}\)

\(A=\frac{3}{2}\)

\(A=\frac{2^4.3^3+2^3.3^4}{2^5.3^3-2^4.3^2}\)

\(A=\frac{2^3.3^3\left(2+3\right)}{2^4.3^2\left(2.3-1\right)}\)

\(A=\frac{2^3.3^3.5}{2^4.3^2.5}\)

\(A=\frac{3}{2}\)

có kq ch bn ?

11/4 giờ = bao nhiêu phút

\(M=\frac{9^4.27^5.3^6.3^4}{3^8.81^4.234.8^2}=\frac{\left(3^2\right)^4.\left(3^3\right)^5.3^6.3^4}{3^8.\left(3^4\right)^4.3^5.\left(2^3\right)^2}\)

\(M=\frac{3^8.3^{15}.3^6.3^4}{3^{18}.3^{16}.3^5.2^6}=\frac{81}{64}\)

\(N=\frac{4^6.9^5.6^9.120}{8^4.3^{12}-6^{11}}=\frac{2^{12}.3^{10}+2^{12}.3^{10}.5}{2^{12}.3^{12}-2^{11}.3^{11}}\)

\(N=\frac{2^{12}.3^{10}.\left(1+5\right)}{2^{11}.3^{11}.\left(2.3-1\right)}=\frac{2.6}{3.5}\)

\(N=\frac{4}{5}\)

\(M=\frac{\left(3^2\right)^4.\left(3^3\right)^5.3^6.3^4}{3^8.\left(3^4\right)^4.3^5.\left(2^3\right)^2}=\frac{3^8.3^{15}.3^6.3^4}{3^8.3^{16}.3^5.2^6}=\frac{3^{29}.3^4}{3^{29}.2^6}=\frac{1.81}{1.64}=\frac{81}{64}\)

\(M=\frac{9^4.27^5.3^6.3^4}{3^8.81^4.243.8^2}\)

\(M=\frac{\left(3^2\right)^4.\left(3^3\right)^5.3^6.3^4}{3^8.\left(3^4\right)^4.\left(3^5\right).\left(2^3\right)}\)

\(M=\frac{3^8.3^{15}.3^6.3^4}{3^8.3^{16}.3^5.8}\)

\(M=\frac{3^{33}}{3^{29}.8}\)

\(M=\frac{3^4}{1.8}\)

\(M=\frac{81}{8}\)

Chúc bạn học tốt !!! 

Sửa hộ mk : 

\(8^2=2^9\)

Kết quả : \(\frac{81}{512}\)