Bài 1 : thực hiện phép tính

a,  -23 + 13 - ( -7 )

b,  | -40 | : 8 + 4 . ( -2 ) + | + 7 |

c,  3 . ( -4 ) ² : ( -12 ) + ( -45 - ( -34 + 31 ) ³ )

Thuc hien phep tinh hop li(neu co the):

1) 69 .113 - 27. 69 + 69 .14 + 31

2) 90 -(2². 25 - 3². 7)

3) 720 - {40.[(120 - 70) :25 + 2³]}

4) 2345 - 1000 :[19 - 2(21 - 18)²]

5) (-23) + 13 + (-17) + 57

6) (-123) + |-13| + (-7)

7) - |-33| +(-15)+ 20 - |45 - 40| - 57

a 12 – 34 b 23 – 47 c 31 – 23 d 9 – 5 e 4 – 15 25 f 23 13 17 57 g 4 . 9 6 . 12 – 7 h 14 6 19 14 19 i 56 – 8. 27 7 j 8 5 . 2 – 3 6 k 4 . 3 125 . 25 8 l 9 6 . 3 – 4 7 m 45. 18 – 15 – 18. 45 – 15 ​

Thuc hien phep tinh 

a,\(\frac{-9}{22}+\frac{5}{31}+\frac{-13}{22}+0.5+2\frac{26}{31}\)

b, -28 . \(\left(\frac{3}{7}-\frac{1}{4}\right)^2\)

c,\(\frac{7}{23}.\left[\left(\frac{-8}{6}\right)-\frac{45}{18}\right]\)

Giúp mik với mik đang cần gấp .Ai làm xong trc 9.00 hôm nay mink tick cho

thuc hien phep tinh a=(155-10/7-5/11+5/23)/(403-26/7/13/11+13/23)+(3/5+3/13-0.9)/(7/91+0.2-3/10)

thuc hien phep tinh (Tinh nhanh neu co the)

(-5/12+7/4-3/8)-|4 va 1/2 -7 va 1/2|-( 1/4-5/2)

1..thuc hien phep tinh

a) [18-(-21)+(-9)]-13

b)125-139+200-(-75)

c) (-33)-(-12)-4

d) 2²+(-31)-3²+50 

1) thuc hien phep tinh

a) 75-(3.5²-4.2³)

b)-/-12/+12-(-24)

c)17.85+15.17-120

2) tim x,biet

a)70-5.(x-3)=45

b)x-7=(-14)+(-8)

c)2./x-2/-4=6

d)128:2^2x-1=4

thuc hien phep tinh(1/2+3/4+7/8+15/16+31/32+63/64) -5 

ban nao lam duoc minh like cho>,<...........................!!!!!!!