\(\frac{\left(456.11+912\right).37}{13.74}\)

\(=\frac{\left(456.11+456.2\right).37}{13.37.2}\)

\(=\frac{[456.\left(11+2\right).37}{13.37.2}\)

\(=\frac{456.13}{13.2}\)

\(=\frac{456}{2}=228\)

a)\(\frac{16.17-5}{16.16+11}=\frac{16.17-16+11}{16.16+11}\)\(=\frac{16.\left(17-1\right)+11}{16.16+11}=\frac{16.16+11}{16.16+11}=1\)

b) \(\frac{45.16-17}{28+45.15}=\frac{45.\left(15+1\right)-17}{28+45.15}\)\(=\frac{45.15+45-17}{28+45.15}=\frac{45.15+28}{28+45.15}=1\)

c) \(\frac{7256.4375-725}{3650+4375.7255}=\frac{\left(7255+1\right).4375-725}{3650+4375.7255}\)\(=\frac{7255.4375+4375-725}{3650+4375.7255}\)\(=\frac{7255.4375+3650}{3650+4375.7255}=1\)

Câu C nhớ sửa 725 thành 7255 nha !

                                                       Bài giải

\(a,\text{ }\frac{16\cdot17-5}{16\cdot16+11}=\frac{16\cdot16+16-5}{16\cdot16+11}=\frac{16\cdot16+11}{16\cdot16+11}=1\)

\(b,\text{ }\frac{45\cdot16-17}{28+45\cdot15}=\frac{45\cdot15+45-17}{45\cdot15+28}=\frac{45\cdot15+28}{45\cdot15+28}=1\)

\(c,\text{ }\frac{7256\cdot4375-725}{3650+4375\cdot7255}=\frac{4375\cdot7255+4375-725}{4375\cdot7255+3650}=\frac{4375\cdot7255+3650}{4375\cdot7255+3650}=1\)

Ta có:

\( \dfrac{7256.4375-725}{3650+4375.7255}\\ =\dfrac{7255.4375+4375-7255}{3650+4375.7255}\\ =\dfrac{7255.4375+\left(4375-725\right)}{3650+4375.7255}\\ =\dfrac{7255.4375+3650}{3650+4375.7255}\\ =1\)

   Vậy giá trị của  \(\dfrac{7256.4375-725}{3650+4375.7255}=1\)

7256.4375-725=(7255+1).4375-725=7255.4375+4375-725=7255.4375+3650

⇒(7256.4375−725)/(3650+4375.7255)=(7255.4375+3650)/(3650+4375.7255)=1

Ta có: \(7256.4375-\dfrac{725}{3650}+4375.7255\)

\(=7256.4375+4375.7255-\dfrac{29}{146}\)

\(=4375\left(7256-7255\right)-\dfrac{29}{146}\)

\(=4375.1-\dfrac{29}{146}\)

\(=\dfrac{638750}{126}-\dfrac{29}{126}\)

\(=\dfrac{638721}{126}=\dfrac{70969}{14}\)

Chúc bn học tốt!!!

=1

l,i,k,e mình nha bạn thân

\(B=\frac{7256.4375-725}{3650+4375.7255}=\frac{7255.4375+4375-725}{7255.4375+3650}=\frac{7255.4375+3650}{7255.4375+3650}=1\)

\(\frac{7256.4375}{3650+4375.7255}\) = \(\frac{7256}{3650+7255}\) = \(\frac{1814}{2715}\)

\(\frac{7256.4375-725}{3650+4375.7255}=\frac{\left(7255+1\right).4375-725}{3650+4375.7255}\)

\(=\frac{7255.4375+4375-725}{3650+4375.7255}\)

\(=\frac{7255.4375+3650}{3650+4375.7255}\)

\(=1\)

\(\frac{7256.4375-725}{3650+4375.7255}\)

\(=\frac{\left(7255+1\right).4375-725}{3650+4375.7255}\)

\(=\frac{7255.4375+4375-725}{3650+4375.7255}\)

\(=\frac{7255.4375+3650}{3650+4375.7255}\)

\(=1\)

\(\frac{7256.4375-725}{3650+4375.7255}=1\)

\(\frac{7256.4375-725}{3650+4375.7255}\) 

\(=\frac{\left(7256-1\right).4375+4375-725}{3650+4375.7255}\)

\(=\frac{7255.4375+3650}{3650+4375.7255}\)

\(=1\)