A = 0,36 x 350 + 0,9 x 45 x 4 + 3 x 20 x 1,2

A = 0,36 x 350 + 3,6 x 45 + 3,6 x 20

A = 0,36 x 350 + 3,6 x (45 + 20)

A = 0,36 x 350 + 3,6 x 65

A = 126 + 234

A = 360

cách làm đi bạn

\(A=0,36.350+0,9.45.4+3.20.12\)
\(A=0,36.350+0,36.45+3,6.20\)
\(A=0,36.350+0,36.45+0,36.10.20\)
\(=0,36.\left(350+45+20.10\right)\)
\(A=0,36.595\)
\(A=214,2\)

\(b.12,8.3,2-y:4,6=35,06\)
\(40,96-y:4,6=35,06\)
\(y:4,6=40,96-35,06\)
\(y:4,6=5,9\)
\(y=5,9.4,6\)
\(y=27,14\)

\(y+y.\frac{3}{2}\)\(+y:\frac{2}{7}\)\(=21\)
\(y.1+y.\frac{3}{2}\)\(+y.\frac{7}{2}\)\(=21\)
\(y(1+\frac{3}{2}+\frac{7}{2}\)\()=21\)
\(y.6=21\)
\(y=\frac{21}{6}\)

A min khi x-3=-1

=>x=2

A max khi x-3=1

=>x=4

\(1964\)

phải làm rõ ràng ra

1964 nha

a: =1-1/2+1/2-1/3+...+1/100-1/101

=1-1/101=100/101

b: =1/3-1/7+1/7-1/11+...+1/107-1/111

=1/3-1/111

=108/333=12/37

c: =3(3/8*11+3/11*14+...+3/197*200)

=3(1/8-1/11+1/11-1/14+...+1/197-1/200)

=3*192/1600=9/25

d: =1/3-1/5+1/5-1/7+...+1/19-1/21

=1/3-1/21

=7/21-1/21=6/21=2/7

3600 bạn nhé happy new year 2016 i love you

3600

Duyệt đi

= (0,36 nhân 3650)+(0,9 nhân 432 nhân 4)+(3 nhân 203nhân1,2)

=1314+1555,2+730,8

=3600

a: =2(3h15'+4h45')=2x8h=16h

b: =(24'30s+25'30s):5

=50':5=10'