\(\left(70-3x\right)\cdot5=2x-\left(15-30\right)\)
=>\(350-15x=2x-\left(-15\right)=2x+15\)
=>\(-15x-2x=15-350\)
=>-17x=-335
=>\(x=\dfrac{335}{17}\)
1)(2x+1)-7=14
2)15-(3x-1)+11=59
3)70-5(x-3)=45
4)412-15.(nhân)(27-x)=97
5)2008(2x+7)=112
6)126-17(3x-5)=7
7)(2600+6400)-3x=1200
8)123-5(x+4)=38
GIÚP MIK GIẢI NHÉ !!! @.@
1/ tính
a,1+3+5+7+...+9
b,1+3+5+7+...+99
c,2+4+6+8+...+10
d,36+37+38+...+70
2/tìm x
a,3x+15=30
b,72-x=64+2x
c,45x-3x=40+2x
d,3x+x=56
e,x-3=0
f,42x=172+x
g,3x=0
h,18.[x-1]=18
i,420.[x-2]=0
a) 3x - ( 15 + 8 ) = 2x- [ -10:(-5) ]
b) -3 |x| = 15-12
c) -7 |x| = -49 + 70
d) -4x - ( 20.-18) = -(3x-40)
Nhanh nhanh dùm mình nha mình đang gấp
Tìm x, biết:
1) 14x - 5 = 8x + 10
2) 15 + 5x = 3x + 30
3) 2x - 5 = 15- 3x
4) 2 ( 3x + 5 ) + 3 ( x + 1 ) = 6x + 20
5) 4 ( x - 3 0 + 5 ( x - 3 ) = 18
( 2x + 13 ) : 5 = 17
360 : ( 11x - 7 ) = 90
30 : ( 3x - 7 ) = 15
tim so nguyen x
(3x+9).(3x-6)=0(2x+15)-25=47-(10-x)30(x=2)-6(x-5)-24x=100/4-3x/=8/2x-5/=13/7x+3/=66
1.
a) 2x + 5 = 34 : 32
b) ( 3x - 24 ) . 73 = 2.74
c) [ 3 . ( 42 - x ) + 15 = 23 . 3
d) 126 + ( 132 - x ) = 300
2.
a) 120 - ( x + 55 ) = 60
b) ( 7x - 11)3 = 25 .52 + 200
c) 2x + 2x+4 = 544
3.
a) 10 + 2x = 49 : 47
b) 70 - 5 ( x - 3 ) = 45
c) 4 + 95 : x = 143 : 142 - 23
-2x-(x-17)=34
17x-(-16x-37)=43
/2x+1\-19=-7
-28-7./-3x+15\=-70
(2x+1)^3-27=243^2:3^3
2x+2+2x+8=65:64
3*5x+^200-5*3x+98=70*125^40
11*3x+99-5*3x^962=81^40
70*4^2x+300+16x+148=140*4^300
Giup minh nha cac bam minh dang voi
