Question

1.Phá ngoặc rồi tính nhanh:

a,(-8)-(-12-8)

b,1765-(312+1765)

c,(31-12)-(46+31-12)

d,(5674-97)-5674

e,(-1075)-(29-1075)

g,(18+29)+(158-18-29)

h,(13-135+49)_(13+49)

Giải nhanh cho mình xong mình tick cho!!!

Answer 1

a, (-8)-(-12-8)=(-8)+12+8= [(-8)+8}]+12= 0+12=12

b, 1765-(312+1765)= 1765-312-1765=(1765-1765)-312=0-312=-312

c. (31-12)-(46+31-12)= 31-12+46-31+12= (31-31)+(12-12)+46=0+0+46=46

d, (5674-97)-5674=5674-97-5674=(5674-5674)-97=0-97=-97

e, (-1075)-(29-1075)=(-1075)+29+1075=[(-1075)+1075]+29=0+29=29

g, (18+29)+(158-18-29)=18+29+158-18-29=(18-18)+(29-29)+158=0+0+158=158

h, (13-135+49)-(13+49)=13-135+49-13-49=(13-13)+(49-49)-135=0+0-149=0-149=-149