Question

11/8 -3/8: 15/16

14 x X + X x 26 = 80 

12x13x14x15 phần 5x14x13x18 làm nhanh giúp mình nhé cảm ơn

Answer 1

a,=1:15/16

=16/15

b,14.x+x.26=80

x.(14+26)=80

x.40=80

x=80:40]

x=2

c,

tui ko làm đc

Answer 2

X x ( 14 + 26 ) = 80

X x 40 = 80

X         = 80 : 40

X          =     2

11/8 - 3/8 : 15/16

8/8 x 16/15

     24/15

Answer 3

\(\dfrac{11}{8}-\dfrac{3}{8}:\dfrac{15}{16}=\dfrac{11}{8}-\dfrac{3}{8}\times\dfrac{16}{15}=\dfrac{11}{8}-\dfrac{2}{5}=\dfrac{55}{40}-\dfrac{16}{40}=\dfrac{39}{40}\)

 

\(14\times x+x\times26=80\)

\(x\times\left(14+26\right)=80\)

\(x\times40=80\)

\(x=80:40\)

\(x=2\)

 

\(\dfrac{12\times13\times14\times15}{5\times14\times13\times18}\)

\(=\dfrac{2\times6\times13\times14\times3\times5}{5\times14\times13\times3\times6}\)

\(=2\)