a) 128 - [(1317 - 1257) . 90 + 61] : 43

= 128 - [60 . 90 + 61] : 43

= 128 - [5400 + 61] : 43

= 128 - 5461 : 43

= 128 - 127

= 1

b) 720 : {4320 : [427 - (173 + 25 . 8)]}

= 720 : {4320 : [427 - (173 + 200)]}

= 720 : {4320 : [427 - 373]}

= 720 : {4320 : 54}

= 720 : 80

= 9.

= (384 +316) + (427+173) + 66

= 700 + 600 + 66

= 1366

=384+316+427+173+66

=700+600+66

=1366

\(25,8\times11,02-1,01\times25,8-10\times25,8\)

\(=25,8\times\left(11,02-1,01-10\right)\)

\(=25,8\times0,01\)

\(=0,258\)

Học tốt 

\(25,8\times11,02-1,01\times25,8-10\times25,8\)

\(=25,8\times(11,02-1,01-10)\)

\(=25,8\times0,01\)

\(=0,258\)

học tốt

Nhớ kết bạn với mình

ta có x.y=BCNN(x,y) nhân UCLN (x,y) do đó UCLN(x,y)=1

mà \(x.y=4320=2^5.3^3.5\)

do đó ta có 8 khả năng sau \(\left(x,y\right)\in\left\{\left(1,4320\right),\left(4320,1\right),\left(2^5,3^3.5\right),\left(3^3.5,2^5\right),\left(2^5.3^3,5\right),\left(5,2^5.3^3\right),\left(3^3,2^5.5\right),\left(2^5.5,3^3\right)\right\}\)

a) 8998 < 9898

    6574 > 6547

    4320 = 4320

    9009 > 900 + 9

b) 1000m = 1km

    980g < 1kg

    1m > 80cm

    1 giờ 15 phút < 80 phút

\(a\)\(=6+182+3.3\)

\(=188+9=197\)

\(b;15-200:50\)

\(=15-4=11\)

\(c;200-60+\frac{170}{7}-8\)

\(=140+\frac{114}{7}\)

\(=\frac{1094}{7}\)

a)18 : 3 + 182 + 3.(51:17)

= 6 + 182 + 3.3

= 188 + 9

= 197

b) 15 - 25.8:(100:2)

= 15 - 200 : 50

= 15 - 4 

= 11

c) 25.8 - 12.5 + 170:17 - 8

= 200 - 60 + 10 - 8

= 142

=19+1811-200

=1630

=1630 k mik nha

=15-200.200

=15-40000

=-39985

Nhớ nhé!

=15-200:200

=15-1

=14