7/2 + 8/27 = bao nhiêu vậy
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NQ
0
HM
0
NV
4
AN
7
PT
3
NK
5
2 tháng 11 2016
dễ ợt!!!
SỐ đó là :
216 x 7/8 = 1512/8 (rút gọn = 189)
2/3 của số đó là:
189 x 2/3 = 126
Đ/S : 126
cái này là toán lớp 4 đúng hơn!
2 tháng 11 2016
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27 tháng 2 2022
a: =(8/27+19/27)+(4/15+11/15)=1+1=2
b: =(12/13+8/13+6/13)+(2/7+5/7)=2+1=3
NB
3
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
26 tháng 5 2023
\(\dfrac{1}{2}\) \(\times\) \(\dfrac{6}{7}\) + \(\dfrac{5}{7\times5}\) - \(\dfrac{8}{9}\)
= \(\dfrac{3}{7}\) + \(\dfrac{1}{7}\) - \(\dfrac{8}{9}\)
= \(\dfrac{4}{7}\) - \(\dfrac{8}{9}\)
= - \(\dfrac{20}{63}\)
TK
8
\(\frac{7}{2}\) + \(\frac{8}{27}\)
= \(\frac{189}{54}\) + \(\frac{16}{54}\)
= \(\frac{205}{54}\)
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phân số tối giản nha