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a) \(24:\left(6-x\right)=8\)
\(6-x=24:8=3\)
\(x=6-3=3\)
Vậy x = 3
b) \(25\cdot5^{x+2}=5^6\)
\(5^2\cdot5^{x+2}=5^6\)
\(5^{x+2}=5^6:5^2=5^{6-2}=5^4\)
\(\Leftrightarrow x+2=4\)
\(x=4-2=2\)
Vậy x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
2/ 125 x (-24+24)
= 125 x 0 =0
3/ -125 x 23 + 23 x 225
= 23 ( -125 + 225)
= 23 x 100 = 2300
![](https://rs.olm.vn/images/avt/0.png?1311)
-x-20-(8-2x)=(-12-3)
-x-20-8+2x=-15
x-28=-15
x=13
Vậy x=13
![](https://rs.olm.vn/images/avt/0.png?1311)
1/(-37) +14+26+37
=[(-37)+37] +(14+26)
= 0 + 40
= 40
2/(-24) +6 +10+24
=[(-24)+24] +(10+6)
= 0 +16
=16
3/15+23+9+(-25) +9+(-23)
=[(-23)+23] +[(-25)+15] +(9+9)
= 0 + (-10) +18
= 0 + 8
= 8
4/60 +33 +(-50) +(-33)
=[(-33)+33]+[60 +(-50)]
= 0 + 10
= 10
5/(-16)+ (-209) + (-14) +209
=[(-209)+209] +[(-16)+(-14)]
= 0 +(-30)
= -30
6/(-12) +(-13)+36 +(-11)
=[(-12) +(-11)] +[ 36+(-13)]
= (-23) + 23
= 0
Chúc bn hok tốt !!!
1, (-37)+14+26+37=[(-37)+37]+14+26=0+40=40
2, (-24)+6+10+24=[(-24)+24]+6+10=0+16=16
3 , 15+23+(-25)+(-23)=[15+(-25)]+[23+(-23)]=-10
4, 60+33+(-50)+(-33)= [60+(-50)]+[33+(-33)]=10
5, (-16)+(-209)+(-14)+209=[(-16)+(-14)]+[(-209)+209]=-30
6, (-12)+(-13)+36+(-11)=[(-12)+(-11)]+[(-13)+36]=(-23)+23=0
![](https://rs.olm.vn/images/avt/0.png?1311)
(3.42.27)2:(32.220)
= ( 3.24.27)2 : (32.220)
= (3.211)2 :(32.220)
= 32.222:(32.220)
=22 = 4
chúc bn hc tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
Cac ban giup minh voi minh phai nop bai trong hom nay cam on
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(M=1+\dfrac{1}{5}+\dfrac{3}{35}+...+\dfrac{3}{9999}\\ =\dfrac{3}{3}+\dfrac{3}{15}+\dfrac{3}{35}+...+\dfrac{3}{9999}\\ =\dfrac{3}{2}\left(\dfrac{2}{1\cdot3}+\dfrac{2}{3\cdot5}+...+\dfrac{2}{99\cdot101}\right)\\ =\dfrac{3}{2}\left(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{99}-\dfrac{1}{101}\right)\\ =\dfrac{3}{2}\left(1-\dfrac{1}{101}\right)=\dfrac{3}{2}\cdot\dfrac{100}{101}=\dfrac{150}{101}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 20 . 24 + 12 . 24 - 48 . 22 ) : 26
= (5.22. 24 + 3.22 . 24 - 3. 24 . 22):26
= ( 5. 26 +3.26- 3.26) :26
= 26( 5+3-3):26
= 26.5:26
= 5
( 20 . 24 + 12 . 24 - 48 . 22 ) : 26
= [24 .(20 + 12) - 48 . 22] : 26
= [24 . 32 - 48 . 22] : 26
= [22 . 22 . 25 - 48 . 22] : 26
= [22 . 27 - 48 . 22] : 26
= [22 . (27 - 48)] : 26
= [22 . (128 - 48)] : 26
= [4 . 80] : 64
= 320 : 64
= 5