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

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

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

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

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

A,      45.16-17=45.15+45-17=28+45.15

Giờ ta thấy cả 2 vế đều có 45.15

Mà

28=28suy ra 45.16-27=28+45.15

B, xét 3650 +4375.7255

==3650+4375.7256-4375=4375.7256-725

Suy ra 2 vế bằng nhau!☺

​

\(=\frac{45.15+45-17}{45.15+58}=\frac{45.15+28}{45.15+58}=???\)

ủa đề sai à ta?

\(\frac{73.15}{103.15}\)

Bạn chỉ cần : 

tính nhanh 

A =1990² -1992.1998

B=2001² -2000.2002

C =2009²-2007.2011

D= (37.13-13):(24+37.12)

E = (16.17-5) :(16.16+11)

F= (45.16-17):(28+45.15)

ban phai chuyen ra thanh so tu nhien thi moi lam duoc.

E =16(16+1) -5 phan 16.16+11 =16.16+16 - 5phan 16.16 +11 = 16.16 +11 phan 16.16 =11

= 45.(15+1)-17/45.15+28

= 45.15+45-17/45.15+28

= 45.15+28/45.15+28

= 1

Tk mk nha

= 45.(15+1)-17/45.15+28

= 45.15+45-17/45.15+28

= 45.15+28/45.15+28

= 1

\(\frac{45.16-17}{45.15+28}\)

\(=\frac{720-17}{675+28}\)

\(=1\)

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

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

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

\(=1\)

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

                         =  \(\frac{45.15+28}{28+45.15}\)

                         =  1

=1

l,i,k,e mình nha bạn thân

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

(7256.4375 - 725)/(3650 + 4375.7255) 
= [(7255 +1).4375 - 725]/(3650 + 4375.7255) 
= [(7255.4375 + 1.4375 - 725]/(3650 + 4375.7255) 
= (7255.4375 + 3650)/(3650 + 4375.7255) = 1 
li ke nha