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![](https://rs.olm.vn/images/avt/0.png?1311)
\(=4\left(2,86+3,14\right)-6,01.5+3\)
\(=4.6-30,05+3\)
\(=27-30,05=-3,05\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =-(3,54+4,783)=-8,323
b: =23-10=13
c: Sửađề: (-2,86)*4,2-3,14*4,2-6*32
=4,2(-2,86-3,14)-192
=-4,2*6-192
=-25,2-192
=-217,2
![](https://rs.olm.vn/images/avt/0.png?1311)
(x-5)^6 = (x-5)^4
(x-5)^4 * (x-5)^2 = (x-5)^4
(x-5)^2= (x-5)^4 :(x-5)^4
(x-5)^2 = 1
Nếu x-5 = 1 thì x= 1+5 =6
Nếu x-5 = -1 thì x= -1 +5 = 4
Vậy x=4; 6
(x - 5)4 = (x - 5)6
x - 5 = 0 hoặc x - 5 = 1
x =5 x = 6
vậy: x = 5 hoặc x = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{1}{4} +\dfrac{1}{28}+\dfrac{1}{70}+\dfrac{1}{130}+\dfrac{1}{208}+\dfrac{1}{304}\)
= \(\dfrac{1}{1.4}+\dfrac{1}{4.7}+\dfrac{1}{7.10}+\dfrac{1}{10.13}+\dfrac{1}{13.16}+\dfrac{1}{16.19}\)
= \(\dfrac{1}{3} +(\dfrac{3}{1.4}+\dfrac{3}{4.7}+\dfrac{3}{7.10}+\dfrac{3}{10.13}+\dfrac{3}{13.16}+\dfrac{3}{16.19})\)
= \(\dfrac{1}{3}(1-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{10}+\dfrac{1}{10}-\dfrac{1}{13}+\dfrac{1}{13}-\dfrac{1}{16}+\dfrac{1}{16}-\dfrac{1}{19})\)
= \(\dfrac{1}{3}(1-\dfrac{1}{19})\)
= \(\dfrac{1}{3}.\dfrac{18}{19}\)
= \(\dfrac{6}{19}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
0,75x-3,5=-0,25x
0,75x+0,25x=3,5
x(0,75+0,25)=3,5
x.1=3,5
x=3,5
Chúc bạn học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
mình xin trả lời:
A=10 vỉ 10 - 5=5
B=5 vì bên trên mình có ghi 10 -5=5
vậy suy ra A=10,B=5
`2,86 . 4 + 3,14 . 4 – 6,01 . 5 + 32. 0,75`
`=4.(2,86+3,14)-30,05+24`
`=4.6-30,05+24`
`=24-30,05+24`
`=17,95`
2,86 . 4 + 3,14 . 4 – 6,01 . 5 + 32. 0,75
=4 . (2,86+3,14) − 30,05 + 24
=4 . 6 − 30,05 + 24
=24 − 30,05 + 24 = (24 + 24) -30,05
=17,95