Tính hợp lí 34+35+36+37-14-15-16-17

a) (-37)+14+26+37 = ( -37 + 37) + ( 14 + 26) = 40
b) (-24)+6+10+24 = ( - 24 + 24) + ( 6 + 10) = 16
c) 15+23+9-25)+(-33) = (15 - 25) + ( 23 - 33) + 9

= - 10 - 10 + 9

= - 11
d) 60+33+(-50)+(-33) = ( 60 -50) + ( 33 - 33)

= 10
e) (-16)+(-209)+(-14)+209 = ( - 16 - 14) + ( - 209 + 209)

= - 30
g) (-12)+(-13)+36+(-11)= ( - 11 -12 - 13 ) + 36

= - 36 + 36 = 0
h) -16+24+16-34 = ( - 16 + 16)+(24 - 34) = - 10
r) 25+37-48-25-37 = (25 - 25)+(37 - 37) - 48 = - 48
u) 2575+37-2576-29 = ( 2575 - 2576) + ( 37 - 29)

= - 1 + 8 = 7
i) 34+35+36+37-14-15-16-17 = ( 34 - 14 )+(35 - 15)+(36-16)+ (37 - 17)

= 80
2 . Bỏ ngoặc rồi tính
a)-7264+(1543+7264) = - 7264 + 1543 + 7264

= 1543
b) (144-97)-144 = 144 - 97 - 144 = - 97
c) (-145)-(18-145) = - 145 - 18 + 145 = - 18
d) 11+(-11+27) = 11 - 11 + 27 = 27
e) (27+514)-(486-73) = 27 + 514 - 486 + 73

= 128
g) (36+79)+(145-79-66) = 36 + 79 + 145 - 79 - 66

= 115
h) 10-[12-(-9-1) = 10 - ( 12 + 9 + 1)

= 10 - 22

= - 12
r) (-28-29+43)-(43+38) = - 28 - 29 + 43 - 43 - 38

= - 95
u ) 271 - [(-43)+271-(-17)] = 271 + 43 - 271 - 17 = 26
i ) -144-[29-(+144)-(+144) = - 144 - 29 - 144 + 144 = -173