= 17/7 + 4/7 - 2/5 + 3/5

= 21/7 - 5/5

= 3 - 1

= 2

ai đề rồi bn ơi

36,4 chứ k phải 36+4 phải ko

hok tốt

nếu 36+4 là 36,4

ta có:

36,4x99+36,4

=36,4x99+36,4x1

=36,4x(99+1)

=36,4x100

=3640

\(\dfrac{12}{7}\) \(\times\) \(\dfrac{3}{4}\) - \(\dfrac{3}{4}\) \(\times\) \(\dfrac{12}{7}\)

= \(\dfrac{9}{7}\) - \(\dfrac{9}{7}\)

= 0 

A = \(2000-\left\{46-\left[24+74.4\right]:15\right\}\)

A = \(2000-\left\{46-\left[24+296\right]:15\right\}\)

A = \(2000-\left\{46-320:15\right\}\)

A = \(2000-\left(46-\frac{64}{3}\right)\)

A = \(2000-\left(\frac{138}{3}-\frac{64}{3}\right)\)

A = \(2000-\frac{74}{3}\)

A = \(\frac{6000}{3}-\frac{74}{3}\)

A = \(\frac{5926}{3}\)

= ( 325 : 5 ) x ( 63 : 9 )

= 65 x 7

= 455

h nha

=325:5x63:9

=65x7

=455

ko chắc đúng

( 325 x 63 ) : ( 5 x 9 ) = ( 325 : 5 ) x ( 63 : 9 ) = 65 x 7 = 455 

a) 0,12 x 400 = 0,12 x 100 x 4 = 12 x 4 = 48

4,7 x 5,5 - 4,7 x 4,5 = 4,7 x (5,5 - 4,5) = 4,1 x 1 = 4,7

k cho chi đi

0,12 x 400 =0,12 x 100 x4

=12 x 4

= 48 

      k mình đi mình k lại ! ^o^

\(a,\dfrac{5}{9}\times\dfrac{5}{2}+\dfrac{4}{9}\times\dfrac{5}{2}=\dfrac{5}{2}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{5}{2}\times1=\dfrac{5}{2}\)

\(12\times\dfrac{3}{4}-\dfrac{3}{4}\times\dfrac{12}{7}=\dfrac{3}{4}\times\left(12-\dfrac{12}{7}\right)=\dfrac{3}{4}\times\dfrac{72}{7}=\dfrac{54}{7}\)

\(=\frac{32+16+8+4+2+1}{64}=\frac{63}{64}\)