\(B=\frac{4^2.25^2+32.125}{2^3.5^2}\)
\(=\frac{\left(2^2\right)^2.\left(5^2\right)^2+2^5.5^3}{2^3.5^2}\)
\(=\frac{2^4.5^4+2^5.5^3}{2^3.5^2}\)
\(=\frac{2^3.5^2.\left(2.5^2+2^2.5\right)}{2^3.5^2}\)
\(=2.5^2+2^2.5\)
\(=2.25+4.5\)
\(=50+20\)
\(=70\)
Bài làm
\(B=\frac{4^2\cdot25^2+32\cdot125}{2^3\cdot5^2}\)
\(B=\frac{\left(2^2\right)^2\cdot\left(5^2\right)^2+2^5\cdot5^3}{2^3\cdot5^2}\)
\(B=\frac{2^4\cdot5^2+2^5\cdot5^3}{2^3\cdot5^2}\)
\(B=\frac{2^4\left(5^2+2\cdot5^3\right)}{2^3.5^2}\)
\(B=\frac{2^4\left[5^2\left(1+2\cdot5\right)\right]}{2^3.5^2}\)
\(B=\frac{2^4\cdot5^2\cdot11}{2^3\cdot5^2}\)
\(B=2.11=22\)
Vậy B = 22
Xl, mik làm bị lỗi rồi nha.
Bài làm
~ Mik làm sai từ đầu á, ~
\(B=\frac{4^2\cdot25^2+32\cdot125}{2^3\cdot5^2}\)
\(B=\frac{2^4\cdot5^4+2^5\cdot5^3}{2^3\cdot5^2}\)
\(B=\frac{2^4\left(5^4+2\cdot5^3\right)}{2^3\cdot5^2}\)
\(B=\frac{2^4\left[5^3\left(5+2\cdot1\right)\right]}{2^3\cdot5^2}\)
\(B=\frac{2^4\cdot5^3\cdot7}{2^3\cdot6^2}\)
\(B=2\cdot5\cdot7=70\)
Vậy B = 70
b
