3/13.6/11.3/13.9/11-3/13.4/11 giúp mình với
3/13.6/11+3/13.9/11-3/13.4/11
`3/13 . 6/11 + 3/13 . 9/11 - 3/13 . 4/11`
`= 3/13 . (6/11 + 9/11 - 4/11)`
`= 3/13 . 11/11`
`= 3/13 . 1 = 3/13`
\(=\dfrac{3}{13}\left(\dfrac{6}{11}+\dfrac{9}{11}-\dfrac{4}{11}\right)\)
\(=\dfrac{3}{13}\times\dfrac{11}{11}=\dfrac{3}{13}\)
Bài 1.(1 điểm) Thực hiện phép tính:
a) A= 3/4 + -5/6
b) B= 3/13. 6/11 + 3/13. 9/11-3/13.4/11
gấp giúp em với ạ
Tính : ( chi tiết ) 6/7 . 8/3 +6/13.9/7 - 4/13.6/7
`6 / 7 . 8 / 13 + 6 / 13 . 9 / 7 - 4 / 13 . 6 / 7`
`= 6 / 7 . 8 / 13 + 6 / 7 . 9 / 13 - 4 / 13 . 6 / 7`
`= 6 / 7 ( 8 / 13 + 9 / 13 - 4 / 13 )`
`= 6 / 7 . 13 / 13`
`= 6 / 7`
Đề phải là `6 / 7 . 8 / 13 + 6 / 13 . 9 / 7 - 4 / 13 . 6 / 7` chứ nhỉ ?
Rút gọn:
3.7.8.13/14.15.26
11.8-11.3/17-6
-17.13+17.2/11.2-11.9
7/9.10^2-2.10^2
7.4^5.3^11+3^13.9^5/6^10+2^12.3^10
2.4+2.4.8+4.8.16+8.16.32/3.4+2.6.8+4.12.16+8.24.32
\(\frac{3.7.8.13}{14\cdot15\cdot26}=\frac{3\cdot7\cdot8\cdot13}{2\cdot7\cdot3\cdot5\cdot2\cdot13}=\frac{8}{5\cdot2\cdot2}=\frac{8}{20}=\frac{2}{5}\)
\(\frac{3.7.8.13}{14.15.26}=\frac{3.7.2^3.13}{2.7.3.5.13.2}=\frac{1.7.2.1}{1.1.1.5.1.1}=\frac{14}{5}\)
\(\frac{11.8-11.3}{17-6}=\frac{11.\left(8-3\right)}{11}=\frac{11.5}{11}=\frac{1.5}{1}=\frac{5}{1}=5\)
\(\frac{-17.13+17.2}{11.2-11.9}=\frac{-17.13+\left(-17\right).2}{11.\left(2-9\right)}=\frac{-17.\left(-13+2\right)}{11.\left(-7\right)}=\frac{-17.\left(-11\right)}{11.\left(-7\right)}=\frac{-17.\left(-1\right)}{-1.\left(-7\right)}=\frac{17}{7}\)
\(\frac{7}{9.10^2-2.10^2}=\frac{7}{100\left(9-2\right)}=\frac{7}{100.7}=\frac{7}{700}=\frac{1}{100}\)
mình làm được tới đó thôi, hihi.
Co ai biết lam con thu 5 ko, giúp minh voi. Dang mai minh nộp bai roi
1. thực hiện phép tính
a, 2/3-5/6+3/4
b, 6/7.8/13+6/13.9/7-4/13.6/7
c, 19. (-26)
\(a,\dfrac{2}{3}-\dfrac{5}{6}+\dfrac{3}{4}\)
\(=(\dfrac{2}{3}+\dfrac{3}{4})-\dfrac{5}{6}\)
\(=\dfrac{7}{12}\)
\(b,\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{-4}{13}.\dfrac{6}{7}\)
\(=\dfrac{6}{7}.(\dfrac{8}{13}-\dfrac{4}{13})+(\dfrac{6}{13}.\dfrac{9}{7})\)
\(=(\dfrac{6}{7}.\dfrac{4}{13})+\dfrac{54}{91}\)
\(=\dfrac{24}{91}+\dfrac{54}{91}\)
\(=\dfrac{78}{91}=\dfrac{6}{7}\)
\(c,19.(-26)\)
\(=-494\)
a) `2/3 - 5/6 +3/4`
`=4/6-5/6+3/4`
`=-1/6+3/4`
`=-4/24+18/24`
`=14/24=7/12`
b) `6/7 .8/13 +6/13 .9/7 -4/13 .6/7`
`=6/7 .(8/13-4/13) + 6/13 .9/7`
`=6/7 . 4/13 + 6/13 . 9/7`
`= 6/13 .4/7 +6/13 .9/7`
`=6/13 . (4/7+9/7)`
`=6/13 . 13/7`
`=6/7`
c) `19.(-26)`
`=(1-20).(20+6)`
`=20+6-400-120`
`=-494`
A=3/11.4/13+(3/13.4/11-1/13)
giúp ik
gửi đến bạn vũ thu trang
4^6x9^5+6^9x120/8^4x3^12-6^11
= (2^2)^6.(3^2)^5 + (2.3)^9.3.5.2^3 / (2^3)^4.3^12 - (2.3)^11
= 2^12.3^10 + 2^9.3^9.3.5.2^3 / 2^12.3^12 - 2^11.3^11
= 2^12.3^10 + 2^12.3^10.5 / 2^11.2. 3^11.3 - 2^11.3^11
= 2^12.3^10.(1+5) / 2^11.3^11.(6-1)
= 2^12.3^10.6 / 2^11.3^11.5
= 4/5
Nhiwf bạn nên mình làm được bài này ! Hihi
6/7.8/13+6/13.9/7-4/13.6/7=?
tính giá trị của biểu thức:
(3.4.2^16)^2/11.2^13.4^11-16^9
bạn nào biết giải giúp mình bài này với