\(a,25.\left(7-27\right)+27.25\)

\(=25.7-27+27.25\)

\(=27.\left(25+25\right)-7\)

\(=27.50-7=135-7=128\)( ko chắc )

\(b,\left(-3\right)^2.\left(-2\right)^3\)

\(=9.\left(-8\right)=-72\)

-1/2+ 2/3 - 3/4 + 4/5

trả lời:

-1/2+ 2/3 - 3/4 + 4/5

=13/60

G = (-3)² + (-5)³ : |-5|

    = ( - 3 )² + ( - 5 )³ : 5 

    = ( - 3 )² + ( - 25 )

    = ( - 16 )

k mik nha mk năn nỉ đó

= 280 :  [25 + ( 30 - 3 mũ 3 ) ]

= 280 :  [ 25 + ( 30 - 27 ) ]

=  280 : ( 25 + 3 )

= 280 : 28

=10  

\(-\frac{1}{2}+\frac{2}{3}-\frac{3}{4}+\frac{4}{5}\)

\(=\left(-\frac{1}{2}-\frac{3}{4}\right)+\left(\frac{2}{3}+\frac{4}{5}\right)\)

\(=\left(-\frac{2}{4}-\frac{3}{4}\right)+\left(\frac{10}{15}+\frac{12}{15}\right)\)

\(=\left(\frac{-2-3}{4}\right)+\left(\frac{10+12}{15}\right)\)

\(=\left(\frac{-5}{4}\right)+\left(\frac{22}{15}\right)\)

\(=\frac{-75}{60}+\frac{88}{60}\)

\(=\frac{-75+88}{60}\)

\(=\frac{13}{60}\)

Mình ghi rõ từng chi tiết rồi nha , chúc bạn học tốt !!! 

-1/2+ 2/3 - 3/4 + 4/5

= (-1/2-3/4) + (2/3+4/5)

= -5/4 + 22/15

= 13/60

=3^6 .3^6 /3^12

=3^12/3^12=1

\(\frac{3^6.3^6}{\left(3.27\right)^3}\)

\(\frac{3^6.3^6}{3^3.3^9}\)

\(=\frac{3^{12}}{3^{12}}=1\)

= 1 nha bn

hok tốt

a) 463+318+137+22

 = (463+137)+(318+22)

 =  600+340

 = 940

b) 185.32-32.85

 =  32.(185-85)

 =  32 . 100

 =  3200

c) \(15:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\)

\(\text{= }15:\left\{390:\left[500-\left(125+245\right)\right]\right\}\)

\(\text{= }15:\left\{390:\left[500-370\right]\right\}\)

\(=15:\left(390:130\right)\)

\(\text{= }15:3\)

\(\text{= }5\)

a)\(463+318+137+22\)

\(=\left(463+137\right)+\left(318+22\right)\)

\(=600+340=940\)

b)\(185.3^2-3^2.85\)

\(=3^2.\left(185-85\right)\)

\(=9.100=900\)

c)\(15:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\)

\(=15:\left\{390:\left[500-\left(125+245\right)\right]\right\}\)

\(=15:\left\{390:\left[500-370\right]\right\}\)

\(=15:\left\{390:130\right\}\)

\(=15:3=5\)

a) 463 + 318 + 137 + 22 = (463 + 137) + (318 +22) = 600 + 340 = 940

Thực hiện phép tính ( bằng cách hợp lí nếu có thể ) 

A. 2/3 - (- 1/4)+3/5-(+7/45)-(-5/9)+1/12+1/39 

B. 6.(-2/3)^2 - 3(-2/3)^2 - 2 : (-3/2)+4