x+7=135 - (135+89)

x+7= 135 - 224

x+7= -89

x = -89-7

x = -96

Vậy x = -96

x+7=135-(135+89)

x+7=135-224

x+7= -89

x= -89 -7

x= -96

Vậy x=-96

x + 7 = 135 - 224

x + 7 = -89

x = -89 -7

x = -96

Vậy x = -96

X+7= -89

X= -89 - 7

X= -96

x+7=135-(135+89)

=>x+7=135-135-89

=>x+7=0-89=-89

=>x=-89-7

=>x=-96

x + 7 = 135 - 135 - 89

x + 7 = 0 -89

x + 7 = -89

     x= -89 - 7

     x= -96

(-135) + 135 + 100

=       0        + 100

=             100

(-135)+100+135= 100

a) 135 + x -135 = 0 => (135 - 135) + x = 0 => x = 0.

b) -562 - x + 562 = 0 => (-562 + 562) - x = 0 => - x = 0 => x = 0.

c) 61 + x - 23 = 91=> (61 - 23) + x = 91=>38 + x = 91=> x = 53.

d) 11 + 53 - x = 97 => 64 - x = 97 => x = 64 - 97 => x = - 33

chịu

gg

135*57+135*86-35*143= 135 (57+86)-35*143=135*143-35*143=143 (135-35)=143*100=14300

91*47+49*53-18*47+24*53=(91*47-18*47)+(49*53+24*53)=47*(91-18)+53*(49+24)=47*73+53*73=73*(47+53)=73*100=7300

a, 

\(135\cdot57+135\cdot86-35\cdot143\)  

\(=135\cdot\left(57+86\right)-35\cdot143\)  

\(=135\cdot143-35\cdot143\) 

\(=143\cdot\left(135-35\right)\) 

\(=135\cdot100\) 

\(=13500\) 

b, 

\(91\cdot47+49\cdot53-18\cdot47+24\cdot53\) 

\(=91\cdot47-18\cdot47+49\cdot53+24\cdot53\) 

\(=47\cdot\left(91-18\right)+53\cdot\left(49+24\right)\) 

\(=47\cdot73+53\cdot73\) 

\(=73\cdot\left(47+53\right)\) 

\(=73\cdot100\) 

\(=7300\)   

a) 13.(23+22)-3.(17+28)

= 13.45 - 3.45

= 45(13-3)

= 45.10 =450

b) -48+48.(-78)+48(-21)

= -48 + 48(-78 - 21)

= -48 + 48.(-99)

= -48 + ( -4752)

= -4800

c) 135.(171-123)-171.(135-123)

= 135.171 - 135.123 - 171.135 + 171.123

= (135.171 - 171.135) - (135.123 - 171.123)

= - 123(135 - 171) = (-123).(-36)= 4428

d: =(1-2)+(3-4)+...+(99-100)

=(-1)+(-1)+...+(-1)

=-50

j: SỬa đề: -1+3-5+7-...-97+99

=(-1+3)+(-5+7)+...+(-97+99)

=2+2+...+2

=2*50=100

e: Sửa đề: 2-4+6-8+...+46-48+50

=(2-4)+(6-8)+...+(46-48)+50

=50-2*24=50-48=2

= 135 + 135 - 135

=  135 +0

= 135

135