22 . 5 + (49 - 172)
= 4 . 5 + (49 - 289)
= 20 + (49 - 289)
= 20 - 240
= - 220
22 . 5 + (49 - 172)
= 4 . 5 + (49 - 289)
= 20 + (49 - 289)
= 20 - 240
= - 220
tính nhanh
-[-171+(171+23)]-[172-(38+172)]-49
a) 29 – [16 + 3.(51 – 49)]
b) 5.22 + 98:72
c) 311 : 39 – 147 : 72
d) 295 – (31 – 22.5)2
718 : 716 +22.33
tính hợp lí:
a.-[171+(171+23)]-[172-(38+172)]-49
B.2750-(2085+2750)-[-438-(29-438)]
GIẢI RÕ RA NHÉ
tính hợp lí:
a.-[171+(171+23)]-[172-(38+172)]-49
b.2750-(2085+2750)-[-438-(29-438)]
giải rõ ra nhé.
a) 513 : 510 – 25.22
b) 20 : 22 + 59 : 58
c) 100 : 52 + 7.32
d) 84 : 4 + 39 : 37 + 50
e) 29 – [16 + 3.(51 – 49)]
f) 5.22 + 98:72
g) 311 : 39 – 147 : 72
h) 295 – (31 – 22.5)2
718 : 716 +22.33
tinh nhanh
a, 39*49-39*17 b,12*53+53*172-53*84
c,17+18+19+99 d, 23+25+49
e,46-45+44-43
(-3).x +22.5= - 37 + 30
a) 295 – (31 – 22.5)2
Tính nhanh
a) \(5-\left(1997-2005\right)+1997\)
b) \(1579-\left(53+1579\right)-\left(-53\right)\)
c) \(-48-\left(357-48\right)+300\)
d) \(173-\left(36+173\right)+[\left(175-27\right)-175-(-36+50)]\)
e) \(-[-171+\left(171+23\right)]-[172-\left(38+172\right)]-49\)
Giúp mik vs ạ