= 0 nha em

bằng 0

nhìn th

địt con mẹ mày lên

\(\dfrac{1}{3}\)-\(\dfrac{2}{15}\)+\(\dfrac{14}{15}\)=\(\dfrac{3}{15}\)-\(\dfrac{2}{15}\)+\(\dfrac{14}{15}\)

=\(\dfrac{13}{15}\)

\(\dfrac{3}{5}\)+4-\(\dfrac{6}{7}\)=\(\dfrac{3}{5}\)+\(\dfrac{20}{5}\)-\(\dfrac{6}{7}\)=\(\dfrac{23}{5}\)-\(\dfrac{6}{7}\)=\(\dfrac{161}{35}\)-\(\dfrac{30}{35}\)=\(\dfrac{131}{35}\)

(-6) + (-5) + (-4) + (-3) + (-2)

= [(-6) + (-4)] + [(-5) + (-3) + (-2)]

= (-10) + (-10)

= (-20)

P/s: Cái bước thứ 3 bạn ghi kết quả ra luôn giống như ở trên mình làm đó, không cần phải dài dòng nhé!

Chúc bạn học tốt!! ^^

Ta có: \(\left(-6\right)+\left(-5\right)+\left(-4\right)+\left(-3\right)+\left(-2\right)\)

\(=-\left(2+3+4+5+6\right)\)

=-20

B1:

A.1+1=2

B.6+2+5=13

C.6+4+6+2+7=25

D.6+4+7+8=25

B2:

A.x+2=3

x=3-2

x=1

B.x+5=4+6

x+5=10

x=10-5

x=5

C.7=4+x

x=7-4

x=3

D.4+x={3+5+7}+{3+5}

4+x=15+8

4+x=23

x=23-4

x=19

Bài 1 :

A.1+1=2

B.6+2+5=13

C.6+4+6+2+7=25

D.6+4+7+8=25

Bài 2 :

A.x+2=3

x=3-2

x=1

B.x+5=4+6

x+5=10

x=10-5

x=5

C.7=4+x

x=7-4

x=3

D.4+x={3+5+7}+{3+5}

4+x=15+8

4+x=23

x=23-4

x=19

Chúc bạn học tốt nha ~_~

8741418+54846852+65268478418654985897485+485495974549548941+95+556874418745985+989797594                                                                                                                                                                                 449859745264857897+5-5954567454187+97456415641874654+56454854564+48564165487-566555541++564564868456556486846589-6564644848654659898595985958948888555555.                         ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Bạn đừng đăng câu hỏi linh tinh lên diễn đàn nhé.

~ Học tốt ~

bn đừng đăng như vậy lênh diễn đàn nx nhé

olm cấm ko đc như vậy nx rồi

1+1+1+1+2+2+2+2+3+3+3+3+4+4+4+4+5+5+5+5+6+6+6+6+7+7+7+7+8+8+8+8+9+9+9+9

= 4(1+2+3+4+5+6+7+8+9)

= \(4\times45\)= 180

B=\(1+3^2+3^4+...+3^{100}\)

9B=\(3^2+3^4+...+3^{100}\)

9B-B=\(\left(3^2+3^4+...+3^{102}\right)-\left(1+3^2+3^4+...+3^{100}\right)\)

8B=\(3^{102}-1\)

B=\(\left(3^{102}-1\right):8\)

C=\(1+5^3+5^6+...+5^{99}\)

125C=\(5^3+5^6+5^9+...+5^{102}\)

125C-C=\(\left(5^3+5^6+5^9+...+5^{102}\right)-\left(1+5^3+5^6+...+5^{99}\right)\)

124C=\(5^{102}-1\)

C=\(\left(5^{102}-1\right):124\)

a: =>4/3x=7/9-4/9=1/3

=>x=1/4

b: =>5/2-x=9/14:(-4/7)=-9/8

=>x=5/2+9/8=29/8

c: =>3x+3/4=8/3

=>3x=23/12

hay x=23/36

d: =>-5/6-x=7/12-4/12=3/12=1/4

=>x=-5/6-1/4=-10/12-3/12=-13/12

em moi lop 4 mà

\(d,-\dfrac{5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)

\(\Leftrightarrow-\dfrac{5}{6}-x=\dfrac{7}{12}+\dfrac{-4}{12}\)

\(\Leftrightarrow-\dfrac{5}{6}-x=\dfrac{1}{4}\)

\(\Leftrightarrow-x=-\dfrac{5}{6}-\dfrac{1}{4}\)

\(\Leftrightarrow-x=-\dfrac{13}{12}\)

\(\Leftrightarrow x=\dfrac{13}{12}\)

\(c,3x+\dfrac{3}{4}=2\dfrac{2}{3}\)

\(\Leftrightarrow3x+\dfrac{3}{4}=\dfrac{8}{3}\)

\(\Leftrightarrow3x=\dfrac{8}{3}-\dfrac{3}{4}\)

\(\Leftrightarrow3x=\dfrac{23}{12}\)

\(\Leftrightarrow x=\dfrac{23}{12}:3\)

\(\Leftrightarrow x=\dfrac{23}{36}\)

3/4 x 4/5 : 3/5 x 6/7 : 1/7 x 5/6

= 3/4 x 4/5 x 5/3 x 6/7 x7/1 x 5/6

= 5

9/10

17/36

7/6

19/12

67/56

12/35

11/8

7/12

25/24

73/21

17/30

2

ok chưa bạn!