\(\left(-3,2\right).\frac{-15}{64}+\left(0,8-2\frac{4}{15}\right):3\frac{2}{3}\)

\(=\frac{3}{4}+\frac{-22}{15}:\frac{11}{3}\)

\(=\frac{3}{4}+\frac{-2}{5}=\frac{7}{20}\)

\(\frac{41}{11}\left(copy\right)\)

Chẳng biết làm 

:)

:)

41/44

41/44

\(\left(-3,2\right).\left(\frac{-15}{64}\right)+\left(0,8-2\frac{4}{15}\right):3\frac{1}{2}\)

đúng đề bài này ko

\(\left(-3,2\right).\left(\frac{-15}{64}\right)+\left(0,8-2\frac{4}{15}\right):3\frac{1}{2}\)

\(=\frac{-16}{5}.\left(\frac{-15}{64}\right)+\left(\frac{4}{5}-\frac{34}{15}\right):\frac{7}{2}\)

\(=\frac{3}{4}+\left(\frac{-22}{15}\right):\frac{7}{2}\)

\(=\frac{3}{4}-\frac{44}{105}\)

\(=\frac{139}{420}\)

( - 3,2 ) . \(\frac{-15}{64}\)+ ( 0,8 - \(2\frac{4}{15}\)) : \(3\frac{1}{2}\)

= \(\frac{3}{4}+\frac{-22}{15}:\frac{7}{2}\)

= \(\frac{3}{4}+\frac{-44}{105}\)

= \(\frac{139}{420}\)

a)3.5²-64:2³

=3.25-64:8

=75-8

=67

b)53.18+2.9.78-18.40

=18.(53+2.9.78-40)

=18..(53+1404-40)

=18.1417

=25506

c)78:{390:[410-(340+15.4)]}+2019⁰

=78:{390:[410-(340+60)]}+1

=78:{390:[410-400]}+1

=78:{390:10}+1

=78:39+1

=2+1

=3

  Cho mk 1 tk nha

b, 53.18+2.9.78-18.40

=53.18+18.78-18.40

=18.(53+78-40)

=18.91

=1638

B={x\(\in\)N|x=3^k; 1<=k<=4}

C={x\(\in\)N|x=4*a²; 1<=a<=5}

D={x\(\in\)N|x=9*a²;1<=a<=4}

E={x\(\in\)N|x=4k; 0<=x<=4}

G={x\(\in\)N|x=(-3)^k; 1<=k<=4}

Bài 3:

a: Ta có: \(23\left(42-x\right)=23\)

\(\Leftrightarrow42-x=1\)

hay x=41

b: Ta có: 15(x-3)=30

nên x-3=2

hay x=5

Bài 1: 

a: 32+89+68=100+89=189

b: 64+112+236=300+112=412

c: \(1350+360+650+40=2000+400=2400\)

mình giúp cho

= -16 / 5 . -15 / 64 + ( 4 / 5 - 34 / 15 ) : 11 / 3

= - 16 / 5 . -15 / 64 + -22 / 15 : 11 / 3

= 3 / 4 + -22 / 15 : 11 / 3

= 3 / 4 + - 2 / 5

= 7 / 20

xong , lần sau nhớ giúp mình nhé ! bye

\(\frac{7}{20}\)đó bn, tính số thập phân ra phân số rồi tính lần lượt.thế nha  ^-^

\(=\frac{7}{20}\)

nha bạn