ai cho tôi 1 tick cho lên tròn 11 đi các bạn

1/(-35).21=(-35).(20+1)=(-35).20+(-35)=(-70)+(-35)=-115

2/87.(-11)=(-87).(10+1)=(-87).10+(-87)=(-870)-87=-957

1/ (-35).(20+1)

  = (-35).20 + (-35).1

  =   -700 + (-35)

  =  -735

2/ 87.(-11)

  =87. (-10+(-1) )

  = 87.(-10) + 87.(-1)

  = -870 +(-87)

  =-957

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)

a)67/63 x 15/3 + 15/31 x 11/21

Thiếu đề

b)15/31 x 34/63 - 11/21 x 15/31

=15/31 x ( 34/63 -11/21)

= 15/31 x  1/63=  5/651

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)

b: =15/31(34/63-11/21)=15/31x1/63=5/651

a: 

a)65 . ( - 101 )

a.(-65).(100+1)=[(-65).100]+1=(-6500)+1=-6499

b.87.(-99)=87.[(-99)+(-1)]=87.(-1000)=-87000

(–57) . 11

= (–57) (10 + 1) (tách 11 = 10 + 1).

= (–57 ) . 10 + (–57 ) . 1 (áp dụng tính chất phân phối của phép nhân)

= –570 + (–57 ) = –(570 + 57) = –627;

( − 25 ) .11 = ( − 25 ) . ( 10 + 1 ) = − 25.10 + ( − 25 ) .1 = − 250 + ( − 25 ) = − 275

= 65 x ( 121 + 11) - 35 x ( 17 + 115 ) 

= 65 x 132 - 35 x 132 

= ( 65 - 35) x 132 

= 30 x 132 

= 3960

65x121-35x17+11x65-115x35=3.960

\(65\cdot121-35\cdot17+11\cdot65-115\cdot35\)

\(=65\cdot\left(11+121\right)-35\cdot\left(115+17\right)\)

\(=65\cdot132+35\cdot132\)

\(=132\cdot\left(65+35\right)\)

\(=132\cdot100\)

\(=13200\)