anh dai dien dep day!!! Giai ne .

7,2:2x57,2+ 2,86x2x64 / 4+4+8+12+20+...+220

= 7,2:2x2x28,6 + 2,86x2x64 / 4+4+8+12+20+32+52+84+136+220

= 0,72x286 + 0,72x286 / 2x2+x12x2+x52x2+x220x2

= (0,72+1,28)x286 / 2x(2+12+52+220) = 2x286 / 2x286 = 1

Anh đạt rất dân chơi

2 ở đâu ra

=572/576

=143/144

hok tốt

Bài làm

\(\frac{7,2:2.57,2+2,86.2.64}{4+8+12+16+...+220}\)

\(=\frac{572}{576}=\frac{143}{144}\)

=584,5-7.25x 0,16+216,66

=584,5-1,16+216,66

=583.34+216.66

=800

584,4 -261 :36 .0,16 +216,66 =584,4 -7,20 .0,16 +216,66

                                          =584,4 -1,152 +216,66

                                          =583,248 +216,66

                                         =799,908

45/g = 5/6 : 2,5

45/g = 1/3

g = 45 : 1/3

g = 135

45/g = 5/6 : 2,5

45/g = 1/3

g = ( 45 : 1 ) x 3 = 135

g=135 vì 5/6:2.5=1/3 nên 45/g=45x1/45x3=45/135

\(7,2\div2\times57,2+2,86\times2\times64\)

\(=7,2\times28,6+2,86\times128\)

\(=72\times2,86+2,86\times128\)

\(=2,86\times\left(72+128\right)\)

\(=2,86\times100=286\)

kq là 286 bn nhé nhớ k mk nhé xong joy kb lun nha

7,2:2x57,2+ 2,86x2x64

= 7,2:2x2x28,6 + 2,86x2x64

= 0,72x286 + 0,72x286 

= (0,72+1,28)x286

= 572

(y-21x13):11=30

y-273=30x11

y-273=330

y=330+273

y=603

(y-21x13):11=30

y-273=30x11

y-273=330

y=330+273

y=603

MIK NHANH NHAT!

( y - 273 )       = 30 x 11

( y - 273 )       = 330

y                   = 330+ 273

y                   = 603

vậy y = 603