(23+77)+(38+62)=100+100

                          =200

23 + 38 + 77 + 62 = 200

nh7y

=????????????

làm gì đấy bạn

a) 23 + (-77) + (-23) + 77 =
[23 + (-23)] + [(-77) + 77]
= …0+0=0……
b) (-2 020) + 2 021 + 21 + (-22)
=[(-2 020) + 2 021] + [21 + (-22)]
= …1……+ (-1)……..
= 0. 

a) 23 + (-77) + (-23) + 77 =
[23 + (-23)] + [(-77) + 77]
= …0+0=0……
b) (-2 020) + 2 021 + 21 + (-22)
=[(-2 020) + 2 021] + [21 + (-22)]
= …1……+ (-1)……..
= 0. 

Ta có:\(77^2+23^2+77.46\)

\(=77^2+2.23.77+23^2\)

\(=\left(77+23\right)^2\)

\(=100^2=10000\)

=77*77+23*23+77*46

=77*(77+46)+23*23

=77*123+23*23

=9471+529

=1000

23+(-77)+(-23)+77

=23+ -(77+23)+77

= 23+ (-100)+77

=(23+77) + (-100)

=100 + (-100)

=(100-100)

=0

Ko bt đúng ko ý

Sai thì cho mik xl

=23+ -23 + -77+77

=0+0

=0

(100+23).23+(200-77).77+456

= 123.23+123.77+456

= 123.(23+77)+456

= 123.100+456

= 12300+456

= 123456

  (100 + 23 ).23 + (200 - 77 ).77 + 456 

= 123 . 23 + 123 . 77 +  456

= 123 (77 + 23 ) + 456

= 123 . 100 + 456 

= 12300 + 456

= 12756 

a) 345 - ( 345 + 77 ) - ( 77 +  23 )

= 345 - 345 - 77  -  77 -  23 

= (345-345) - (77+23) - 77

= 0 - 100 - 77

= -100 - 77

= -177

b) 234 + ( 433 - 234 )

= 234 + 433 - 234

= (234-234) + 433

= 0 + 433

= 433

a) 345 - ( 345 + 77 ) - ( 77 +  23 )

= 345 - 345 - 77 - 77 + 23 = -77 - 77 + 23

= -77.2 + 23

= -154 + 23

= -131

b) 234 + (433 - 234) 

= 234 + 433 - 234

= (234 - 234) + 433

= 0 + 433

= 433

a, 345 - ( 345 + 77 ) - ( 77 + 23 )

= 345 - 345 - 77 - 77 - 23

= - 23

b, 234 + ( 433 - 234 )

= 234 + 433 - 234

= ( 234 - 234 ) + 433

= 433

77/23+23/23=100/23

Đáp số 100/23

\(\frac{77}{23}+\frac{23}{23}\)\(=\frac{77}{23}+1=\frac{100}{23}\)

\(\frac{77}{23}+\frac{23}{23}=\frac{77+23}{23}=\frac{100}{23}\)

815 - 23 - 77 + 85 

= 815 + 85 - 23 - 77

= ( 815 + 85 ) - ( 23 + 77 )

= 900 - 100

= 800

\(815-23-77+85\)

\(=\left(815+85\right)-\left(23+77\right)\)

\(=900-100=800\)

= 800

HOK TỐT

\(815-23-77+185\)

\(=\left(815+185\right)-\left(23+77\right)\)

\(=1000-100=900\)

815-23-77+185

= 792-77+185

=715+185

=900

\(815-23-77+185\)

\(=(815+185)-\left(23+77\right)\)

\(=1000-100\)

\(=900\)