Tinh nhanh neu co the:
a.167 + (-252) + 52 | b.(-15).19+80.(-15)+(-15) |
c.23 - 63 : 62 + 15.22 | d.(-882+139)-(18-61)+1 |
e. 5.4.35.25.20 | g.(55+45+15)-(15-55+45) |
f. (- 624) - [( 376 + 235 ) - 35] | h.1152-(374+1152)+(-65+374) |
i. 49. ( 51 - 4 ) - 51. ( 49 + 4 ) | j.{-125+2[56-48:(-7+15)]}:5 |
a; 167 - (252) + 52
= 167 - (252 - 52)
= 167 - 200
= - 33
b; (-15).19 + 80.(-15) + (-15)
= - (15).(19 + 80 + 1)
= -15.(99+ 1)
= -15.100
= - 1500
c; 23 - 63 : 62 + 15.22
= 8 - 6 + 15.4
= 2 + 60
= 62
d; (-882 + 139) - (18 - 61) + 1
= - 882 + 139 - 18 + 61 + 1
= (-882 + (61 + 1)) + (139 - 18)
= (-882 + 62) + 121
= - 820 + 121
= - 699