Tính A= [(- 8 ) + ( - 7 ) ] + ( -10)

Bµi 1:TÝnh     

 A= [(- 8 ) + ( - 7 ) ] + ( -10)                                       

 B = - ( - 299 ) + ( - 219 ) + ( -401 ) + 12

 C  = 555 + ( - 100)  + ( -80) +                          

 D = + ( - 40 ) + 3150 + ( - 307)

 E= 98 . 42 – {50 . [(18 – 23) : 2 + 32 ]}                       

 F = - 80  - [ - 130 – ( 12 – 4 )2] + 20080

 G = 1000 + ( - 670 ) + 297 + ( - 330 )                        

 H = 1024 : 24 + 140 : ( 38 + 25) – 723 : 721

 I  =                                              

Bµi 2 : T×m x  Z biÕt :

 a) ( - x + 31 ) – 39 = - 69             

 b) – 121 – ( - 35 – x ) = 50      

c) 17 + x – ( 352 – 400 ) = - 32

d) 2130 – ( x + 130 ) + 72 = - 64   

 e)      

f)     

i) ( x – 2 ) – ( -8 ) = - 137                

 k) 15 – ( - x + 18 ) = - 24