5.(2.x+7)=107
1) x+1/2=-5/3
2) 1/3-x=3/5
4) x-4/3=-7/9
5) x--7/3=5/6
6) x-1/5=9/10
7) x+5/12=3/8
8) x+5/4=7/6
9) x-2/7=1/35
10) x-2/7=-7/10
6: =>x=9/10+1/5=9/10+2/10=11/10
7: =>x=3/8-5/12=36/96-40/96=-1/24
8: =>x=7/6-5/4=14/12-15/12=-1/12
9: =>x=1/35+2/7=1/35+10/35=11/35
10: =>x=2/7-7/10=20/70-49/70=-29/70
1, \(x=-\dfrac{5}{3}-\dfrac{1}{2}=-\dfrac{10}{6}-\dfrac{3}{6}=-\dfrac{13}{6}\)
2, \(x=\dfrac{1}{3}-\dfrac{3}{5}=\dfrac{5-9}{15}=-\dfrac{4}{15}\)
4, \(x=-\dfrac{7}{9}+\dfrac{4}{3}=\dfrac{-7+12}{9}=\dfrac{5}{9}\)
5, \(x=\dfrac{5}{6}-\dfrac{7}{3}=\dfrac{5-14}{6}=-\dfrac{9}{6}=-\dfrac{3}{2}\)
6, \(x=\dfrac{9}{10}+\dfrac{1}{5}=\dfrac{9+2}{10}=\dfrac{11}{10}\)
7, \(x=\dfrac{3}{8}-\dfrac{5}{12}=\dfrac{9-10}{12}=-\dfrac{1}{12}\)
8, \(x=\dfrac{7}{6}-\dfrac{5}{4}=\dfrac{14-15}{12}=-\dfrac{1}{12}\)
9, \(x=\dfrac{1}{35}+\dfrac{2}{7}=\dfrac{1+10}{35}=\dfrac{11}{35}\)
10, \(x=-\dfrac{7}{10}+\dfrac{2}{7}=\dfrac{-49+20}{70}=\dfrac{-29}{70}\)
1) x+1/2=-5/3
2) 1/3-x=3/5
4) x-4/3=-7/9
5) x--7/3=5/6
6) x-1/5=9/10
7) x+5/12=3/8
8) 5/4=7/6
9) x-2/7=1/35
10) x-2/7=-7/10
cả phép tính nữa nha
1: =>x=-5/3-1/2=-13/6
2: =>x=1/3-3/5=-4/15
4: =>x=-7/9+4/3=-7/9+12/9=5/9
5: =>x=5/6-7/3=5/6-14/6=-9/6=-3/2
6: =>x=9/10+1/5=11/10
7: =>x=3/8-5/12=36/96-40/96=-1/24
8: Đề sai rồi bạn
1) Tính hợp lý nếu có thể
d) 720∶(7^15 .15+7^15 .34)
e) 5 .2^3+7^9 ∶7^7-1^2021
2) Tìm x ------------------------------
a) 2x+27=55
b) 76-6(x-1)=10
c) 3 .4^x-7=185
d) x ⋮17 và 30<x<100
e) 5^(2x-3)-2 .5^2=5^2
f) 17 ⋮x-3
Help mình làm bài nha
647 - [ 6 . ( 107 . 8 - 7 . 2^3) + 5 . 2^5 : 2^4
647 - [6. (107 . 8 - 7 . 23) + 5 . 25 : 24 ]
= 647 - [6. (856 - 7 .8) + 5 . 2 ]
= 647 - [6. (856 - 56) + 5 . 2]
= 647 - [6. 800 + 5 . 2]
= 647 - [ 4800 + 10]
= 647 - 4810
= -4163
Tính giá trị các đa thức sau tại x=-1?
a) P(x)=x^2 + x^4 + x^6 + x^8 + ... + x^106.
P(-1)=
b) Q(x)=x + x^3 + x^5 + x^7 + ... + x^107
Q(-1)=
a) \(P\left(-1\right)=\left(-1\right)^2+\left(-1\right)^4+...+\left(-1\right)^{106}\)
\(=1+1+...+1\)
=53
b) \(Q\left(-1\right)=\left(-1\right)+\left(-1\right)^3+\left(-1\right)^5+...+\left(-1\right)^{107}\)
\(=-1\cdot54=-54\)
4. x^2 − 5x + 6
5. x^2+7x+10
6. x + 7√x + 10
7. 3x^4 + 7x^2 + 4
8. x^2-x-2
9. x^6 − x^3 − 2
`4)x^2-5x+6`
`=x^2-2x-3x+6`
`=x(x-2)-3(x-2)=(x-2)(x-3)`
`5)x^2+7x+10`
`=x^2+5x+2x+10`
`=x(x+5)+2(x+5)=(x+5)(x+2)`
`6)x+7\sqrt{x}+10` `ĐK: x >= 0`
`=(\sqrt{x})^2+5\sqrt{x}+2\sqrt{x}+10`
`=\sqrt{x}(\sqrt{x}+5)+2(\sqrt{x}+5)=(\sqrt{x}+5)(\sqrt{x}+2)`
`7)3x^4+7x^2+4`
`=3x^4+3x^2+4x^2+4`
`=3x^2(x^2+1)+4(x^2+1)=(x^2+1)(3x^2+4)`
`8)x^2-x-2`
`=x^2-2x+x-2`
`=x(x-2)+(x-2)=(x-2)(x+1)`
`9)x^6-x^3-2`
`=x^6+x^3-2x^3-2`
`=x^3(x^3+1)-2(x^3+1)`
`=(x^3+1)(x^3-2)`.
Phân tích đa thức thành nhân tử:
Giúp mình nhé :
Đề bài : Tính tích
1 x 3 x 5 x 7 x ... x 107 x 109 x 111
Bài 1:Tìm x,y thuộc Z biết:
a) 3x - 12 / 3y - 9 =68 / 51 và x - y = 5
b) 22x - 11 / 33 - 44y = 7 / 35 và x + y = 2
Bài 2: Rút gọn phân số:
a)1 . 3 . 5.....39 / 21 . 22 . 23.....40
b)54 . 107 - 53 / 53 . 107 + 54
c)135 . 269 - 133 / 134 . 269 + 135
Các bạn giúp mình nhanh nha! Mai phải nộp rồi
1. tính :
A = 7/11 . -39/190 . 76/21
B = (5/8 + 4/5 ).( 2-2/107 )
\(A=\frac{7}{11}\cdot\frac{-39}{190}\cdot\frac{76}{21}=\frac{-39\cdot7\cdot76}{11\cdot190\cdot21}=\frac{-273}{550}\)
B=\(\left(\frac{5}{8}+\frac{4}{5}\right)\)\(\cdot\left(2-\frac{2}{107}\right)\)
=>B=\(\frac{57}{40}\cdot\frac{212}{107}=\frac{57\cdot212}{40\cdot107}=\frac{3021}{1070}\)