34(66-5)-66(34+5)=34.66-34.5-34.66-66.5=(34.66-34.66)-5(34+66)=-500

=34x66-34x5 -66x34-66x5

=-34x5-66x5

=5x(-34-66)=5x(-100)=-500

34.(66-5)-66.(34+5)=(34-34).(66-66).(5+5)=0.0.10=0

       \(34.\left(66-5\right)-66.\left(34+5\right)\)

\(=34.66-34.5-66.34-66.5\)

\(=\left(34.66-66.34\right)-\left(34.5+66.5\right)\)

\(=0-\left(34+66\right).5\)

\(=0-100.5\)

\(=0-500\)

\(=-500\)

`35 xx 34 + 35 xx 66 + 100 xx 7`

`= 35 xx ( 34+66) + 100 xx 7`

`= 35 xx 100 + 100 xx 7`

`= 3500 + 700`

`= 4200`
 

`35xx34+35xx66+100xx7`

`=35xx(34+66)+100xx7`

`=35xx100+100xx7`

`=100xx(35+7)`

`=100xx42`

`=4200`

  đây nha😀😀😄😁

Chúc bạn học tốt!

34 . ( 66 - 5 ) - 66 . ( 34 + 5 )

= 34 . 61 - 66 . 39

= 2074 - 2574

= - 500

\(=\left[66+34+77+23+12+88+45+55\right]\times\left[1808\times\left(25-25\right)\right]\\ =0\)

\(34.\left(66-5\right)\)\(-66.\left(34+5\right)\)

\(=34.66-34.5\)\(-66.34-66.5\)

\(=-34.5-66.5\)

\(=5.\left(-34-66\right)\)

\(=5.\left(-100\right)\)

\(=-500\)

k mk nhe

Lời giải:
a. $(132\times 6-66\times 12)\times (132\times 6+66)$

$=(66\times 2\times 6-66\times 12)\times (132\times 6+66)$

$=(66\times 12-66\times 12)\times (132\times 6+66)$

$=0\times (132\times 6+66)=0$

b.

$100-99+98-97+96-95+...+4-3+2$

$=(100-99)+(98-97)+(96-95)+....+(4-3)+2$

$=1+1+1+....+1+2$

Số lần xuất hiện của 1 là: $[(100-3):1+1]:2=49$

Giá trị của tổng cần tính là: $1\times 49+2=51$

(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 1808 x 25)

=(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200-45200)

=(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x 0

=0

(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 1808 x 25)

= (12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 45200 )

= (12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x 0

= 0 

= [ (12+88) + (77+23) + (34+66) + (45+55) ] x ( 45200 - 45200 )

= [ 100 + 100 + 100 + 100 ] x 0

= 400

ĐÁP ÁN  : 400