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330.(x - 2) = 332 - 331
=> 330.(x - 2) = 331.(3 - 1)
=> x - 2 = 3.2
=> x - 2 = 6
=> x = 6 + 2
=> x = 8
Vậy x = 8
\(3^{30}.\left(x-2\right)=\left(3^{32}-3^{31}\right)\)
\(3^{30}.\left(x-2\right)=3^{31}.\left(3-1\right)\)
\(x-2=3.2\)
\(x-2=6\)
\(x=8\)
Vậy x = 8
a)(x+28):13=25,2
x+28=25,2.13
x+28=327,6
x=327,6-28
x=299,6
b)(7x+6)*5^5=5^8
7x+6=5^8:5^5
7x+6=5^3
7x+6=125
7x=125-6
7x=119
x=119:7
x=17
c)(x-3)^2-23=2
(x-3)^2=2+23
(x-3)^2=25
x-3=5
x=5+3
x=8
d)3^30(x-2)=(3^32-3^31)
3^30(x-2)=3^1
x-2=3^1:3^30
x-2=3-29
x=3-29+2
31x72 - 31x70 - 31 x 2 - 31
=31x(72 -70 -2 -1)
=31 x (-1)
= -31
những câu sau thì lam tương tự nha bạn ^_^
1 + 2-3-4+5+6-7-8+9+...+28-29-30+31 + 32
= 1 + (2-3-4+5) + (6-7-8+9) + ...+(28-29-30+31) + 32
= 1 + 0+0+...+0+32
= 1+32
=33
1+2-3-4+5+6-7-8+9+...+28-29-30+31+32?
( 1 + 2 - 3 - 4 ) + ( 5 + 6 - 7 - 8 ) + ...... + ( 29 + 30 - 31 - 32 )
= 0 + 0 + ....+ 0
= 0
\(\left(3^{31}+3^{32}+3^{33}\right):\left(3^{30}+3^{29}+3^{28}\right)\)
\(=\left(3^{31}+3^{31}.3+3^{31}.3^2\right):\left(3^{28}.3^2+3^{28}.3+3^{28}\right)\)
\(=3^{31}.\left(1+3+3^2\right):3^{28}\left(3^2+3+1\right)\)
\(=\left(3^{31}:3^{28}\right).\left[\left(1+3+3^2\right):\left(1+3+3^2\right)\right]\)
\(=3^3.1\)
\(=27\)
3^31:3^30+3^31:3^29+3^31:3^28+3^32:3^30+3^32:3^29+3^32:3^28+3^33:3^30+3^33:3^29+3^33:3^28
3+3^2+3^3+3^2+3^3+3^4+3^3+3^4+3^5=507
- 330. (x-2)=(332 -331) =>330,(x-2)=330(32-3)=>x-2=6=>x=8
- (x-3)3=125=>x-3=5=>x=8
- (2x+1)3=343=>2x+1=7=>x=3
- 16x <1284=>(24)x <(27)4=>24x<228=>4x<28=>x<7
số số hạng là :
( 1000000 - 1 ) : 1 + 1 = 1000000
tổng là :
( 1000000 + 1 ) x 1000000 : 2 = 500000500000
đáp số : 500000500000
\(3^{30}\left(x-2\right)=\left(3^{32}-3^{31}\right)\)
\(\Rightarrow3^{30}\left(x-2\right)=3^{31}\left(3-1\right)\)
\(\Rightarrow3^{30}\left(x-2\right)=3^{31}.2\)
\(\Rightarrow x-2=3^{31}.2:3^{30}\)
\(\Rightarrow x-2=3.2=6\)
\(\Rightarrow x=6+2=8\)
sai dau bai