5000 k nha

500 nha

= 25 x  ( 1 + 86 + 12 + 1 + 100 )

= 25 x ( 87 +12 +1 + 100 )

= 25 x ( 99 +1 + 100)

= 25 x ( 100 +100)

= 25 x 200

= 5000

\(25+25=25x2=50\)

25+25=50

25 + 25 = 50

Mk đầu tien k mk

390 nhé k mik nhé

25+75+63+27+96+15+4+85=390 tk m nhé

390 nha bạn 

kết bạn nhé 

i, \(-25-\left(-64\right)-75+36\)

\(=-25+64-75+36\)

\(=39-75+36\)

\(=-36+36\)

\(=0\)

k, \(\left(15-20\right)+145\)

\(=-5+145\)

\(=140\)

i, -25-(-64)-75+36=0

k, (15-20)+145=140

:))

k giùm:>

- 25 - ( - 64 ) - 75 + 36

= \(-25+64-75+36\) 

\(=\left(64+36\right)-\left(25+75\right)\) 

\(=100-100\) 

\(=0\)  

\(\left(15-20\right)+145\)

\(=15-20+145\)  

\(=145+15-20\)

\(=160-20\)

\(=140\)

a) 25 + 25 + 65 = 115

b) 65 - 25 - 25 = 15

115,65

a) = 115

b) = 15

k mik nha !

Ta có

125 + 256 + 98 = 479 nha 

56 + 579 + 8 = 643 nhá 

12 8 25 * 365/5 = 21900 nhà 

T ik nha ban 

Chuc ban hoc tot nhả !!!

125 + 256 + 98 = 479

56 + 579 + 8 = 643

12* 25* 365/5 = 21900

K CHO MÌNH NHA # ! #

479;643;21900

\(125-25=100\)

\(1678-78=1600\)

Ai k mình... mình k lại nha..

\(Thề\)á

125-25=100

1678-78=1600

=100

=1600 k nha

\(\frac{25}{1.6}+\frac{25}{6.11}+........+\frac{25}{86.91}\)

\(=5.\left(\frac{5}{1.6}+\frac{5}{6.11}+.....+\frac{5}{86.91}\right)\)

\(=5.\left(1-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+......+\frac{1}{86}-\frac{1}{91}\right)\)

\(=5.\left(1-\frac{1}{91}\right)\)

\(=\frac{90}{91}\)

1-1/6+1/6-1/11+....+1/86-1/91

1-1/91

90/91

\(\frac{25}{1.6}+\frac{25}{6.11}+....+\frac{25}{86.91}\)

\(=\frac{25}{5}.\left(\frac{5}{1.6}+\frac{5}{6.11}+.....+\frac{5}{86.91}\right)\)

\(=\frac{25}{5}.\left(\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+....+\frac{1}{86}-\frac{1}{91}\right)=5.\left(1-\frac{1}{91}\right)=5.\frac{90}{91}=\frac{450}{91}\)

25x25x10x25x20 = 3125000

=3125000 nha

3125000