\(15.\left(-176\right)+15.76\)

\(=15.76-15.176\)

\(=15.\left(76-176\right)\)

\(=-15.100=-1500\)

 15( - 176) + 15 x 76

= 15[( -176) + 76]

=15(-100)

= -1500

hok good

15.(-176)+15.76

15.[(-176)+76]

15.-100

-1500

Lời giải:

a.

$=-37-x-23+15=-x-(37+23)+15=-x-60+15=-x-(60-15)=-x-45$

b.

$=176-176+x-42=0+x-42=x-42$

c.

$=1270-1270+2x+31=0+2x+31=2x+31$

d.

$=2x-141-231+461=2x-(141+231)+461=2x-372+461$

$=2x+(461-372)=2x+89$

a: \(-37\cdot86+37\cdot76\)

\(=-37\left(86-76\right)\)

\(=-37\cdot10=-370\)

b: \(-79\cdot81+79\cdot31-79\cdot50\)

\(=79\left(-81+31-50\right)\)

\(=79\cdot\left(-100\right)=-7900\)

c: \(15\cdot\left(-176\right)+15\cdot75-\left(-15\right)\)

\(=15\cdot\left(-176\right)+15\cdot75+15\)

\(=15\left(-176+75+1\right)\)

\(=15\cdot\left(-100\right)=-1500\)

a: 

b: 

c: 

a)     176 + 15 + 24 + 235 = ( 176 + 24) + ( 15 + 235)

                                  = 200 + 250

                                  = 450                  

1050 : 15 - 350 : 5 + 167

= 70 - 70 + 167

= 0 + 167

= 167

~ Hok tốt ~

ko ghi lại đề bài 

=70-70+167

=0+167

=167

hc tốt

ko ghi lại đề bài

=70-70+167

=0+167

=167

hc tốt

\(\text{15.(-176)+15.76+100.15}\)

\(=15.\left(-176+76+100\right)\)

\(=15.0\)

\(=0\)

\((-18)+(-31)+98+\left|-18\right|+(-69)\)

\(=(-18)+(-31)+98+18+(-69)\)

\(=(-18)+18+(-31)+(-69)+98\)

\(=0+(-100)+98=-2\)

\(17(15-16)+16(17-20)\)

\(=17\cdot15-17\cdot16+16\cdot17-16\cdot20\)

\(=17\cdot15-16\cdot20\)

\(=-65\)