[ 153 + ( -76 )] - [ -176 - ( -152 )]

= ( 153 - 76 ) - ( -176 + 152 )

= 77 - ( -24 )

= 77 + 24

= 101

[153+(-76)]-[-176-(-152)]

=77 +24 =101

101 nha !

Học tốt ^^

42+y/76=153/171

y/76=153/171-42

y/76=-781/19

y=-781/19*76

y=-3124

y=642

\(\frac{42+y}{76}=\frac{153}{171}=\frac{17}{19}\)

\(\Rightarrow\left(42+y\right)\times19=76\times17\)

\(\left(42+y\right)\times19=1292\)

\(42+y=1292:19\)

\(42+y=68\)

\(y=68-42\)

\(y=26\)

CHÚC BN HỌC TỐT!!!!!!!

cam on

42+x/76=153/171

x/76=42-153/171

x/76=5922/171-153/171

x/76=5769/171

x.171=76.5769

x.71=438444

x=438444:71

x=6175,...

vay x=6175,....

de bai sai xao y ban a

6175 bạn nha 

42 + y/76 = 153/171

y/76=153/171 - 42

y/76 = 781/19

y = 3124

\(\frac{42+y}{72}=\frac{153}{171}\)

\(\Rightarrow\left(42+y\right)\times171=76\times153\)

\(\Rightarrow\left(42+y\right)\times171=11628\)

\(\Rightarrow42+y=11628:171=68\)

\(\Rightarrow y=68-42=26\)

\(\frac{42+y}{76}=\frac{153}{171}\Rightarrow171\left(42+y\right)=153.76\Rightarrow7182+171y=11628\Rightarrow171y=4446\Rightarrow y=26\)

Vậy y = 26

\(\frac{42+y}{76}=\frac{153}{171}\)

\(\left(42+y\right).171=153.76\)

\(\left(42+y\right).171=11628\)

\(42+y=11628:171\)

\(42+y=68\)

\(y=68-42\)

\(y=26\)

\(\)