= ( - 29) . 135 + 13 . 135 +( - 2730)

= 135 . [ ( - 29) + 13] + ( - 2730)               mik nghĩ là như này

= 135 . ( - 16) + ( - 2730)

= ( - 2160) + ( - 2730)

= - 4890                                  

$A=(-135)\cdot29-13\cdot135+42\cdot(-65)$

$=(-135)\cdot29+13\cdot(-135)+42\cdot(-65)$

$=(-135)\cdot(29+13)+42\cdot(-65)$

$=(-135)\cdot42+42\cdot(-65)$

$=42\cdot(-135-65)$

$=42\cdot(-200)$

$=-8400$

A = (-135). 29 - 13. 135 + 42. (-65)

A = 135. (-29) - 13. 135 + 42. (-65)

A = 135. [(-29) - 13] + 42. (-65)

A = 135. (-42) + 42. (-65)

A = 135. (-42) + (-42). 65

A = (-42). (135 + 65)

A = (-42). 200

A = -8400

A = (-135). 29 - 13. 135 + 42. (-65)

A = 135. (-29) - 13. 135 + 42. (-65)

A = 135. [(-29) - 13] + 42. (-65)

A = 135. (-42) + 42. (-65)

A = 135. (-42) + (-42). 65

A = (-42). (135 + 65)

A = (-42). 200

A = -8400

Các bạn nhớ ghi cách làm ra nhé!

b: =124-312+76-112+21

=200-424+21

=221-424

=-203

a: =735+23-135+177=600+200=800

b: =124-312+76-112+21=200-424+21=-203

c: =183+21+65-183-21=65

d: \(=-271+37-160+31-137=-500\)

e: =-3a+b-3c+b+3c+2a-2b

=-a

= 135.35 - 135.42 - 35.135 + 35.42

= 135(35-35) - 42(135-35) 

= 0 - 42.100

= -4200

\(135.(35-42)-35.(135-42) \)

\(=135.(35-42)\)

\(=135.(-7)\)

\(=-945\)

`a) 127 + 29 + 73`

`= (127+73)+29`

`= 200 + 29`

`= 229`

`c) 135 + 360 + 65 + 40`

`= (135+65)+(360+40)`

`= 200+400`

`= 600`

`c) 417-17-299`

`= (417-17)-299`

`= 400 - 299`

`= 101`

`d) 981-781+29`

`= (981-781)+29`

`= 200 + 29`

`= 229`

a) 127 + 29 + 73 = 229

b) 135 + 360 + 65 + 40 = 600

c) 417 - 17 - 299 = 104

d) 981 - 781 + 29 = 229

Chúc bạn học tốt!! ^^

a) Ta có: \(\left(-65\right)\cdot\left(87-17\right)-87\cdot\left(17-65\right)\)

\(=-65\cdot87+65\cdot17-87\cdot17+87\cdot65\)

\(=17\left(65-87\right)=17\cdot\left(-22\right)=-374\)

b) Ta có: \(\left(135-35\right)\cdot\left(-37\right)+37\cdot\left(-42-58\right)\)

\(=\left(-100\right)\cdot37+37\cdot\left(-100\right)\)

\(=37\left(-100-100\right)=37\cdot\left(-200\right)=-7400\)

Carm ơn bạn nhiều ạ!