x:4/8=13/-19+8/15
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`72.121 + 27.121 + 121`
`=72.121+27.121+121.1`
`=121.(72+27+1)`
`=121.100`
`=12100`
Khoảng cách :`3`
Số hạng :
`(100-1)/3 + 1 = 34(số-hạng)`
Tổng:
`(100+1)xx34:2=1717`
___________________________________
`(x-29)-11=0`
`x-29=0+11`
`x-29=11`
`x=11+29`
`x=40`
________________________
`(x+5):3-11=4`
`(x+5):3=4+11`
`(x+5):3=15`
`x+5=15xx3`
`x+4=45`
`x=45-5`
`x=40`
___________________________
`(x+5):3-11=4`
`(x+5):3=4+11`
`(x+5):3=15`
`x+5=15 . 3`
`x+5=45`
`x=45-5`
`x=40`
_________________________
`231+(312-2x)=531`
`312-2x=531-231`
`312-2x=300`
`2x=312-200`
`2x=12`
`x=12:2`
`x=6`
_______________________
`(50-x)+12=31`
`50-x=31-12`
`50-x=19`
`x=50-19`
`x=31`
__________________
`75:(x-4)+4=7`
`75:(x-2)=7-4`
`75:(x-2)=3`
`x-2=75:3`
`x-2=25`
`x=25+2`
`x=27`
___________________
`125-3.(x+3)=65`
`3.(x+3)=125-65`
`3.(x+3)=60`
`x+3=60:3`
`x+3=20`
`x=20-3`
`x=17`
Bài 8A :
a/ 72.121+27.121+121
= 72.121+27.121+121.1
= 121. ( 72 + 27 +1 )
= 121.10012100
b/100 + 97 + 94 + ..... + 4 +1
Có tất cả các số hạng là:
( 100-1) :3 +1 = 34
Tổng dãy số trên là:
( 100+1) x 34 : 2 = 1717
Bài 10A :
a/ ( x - 29 ) - 11 = 0
= x-29 = 0+11
= x - 29 = 11
= x = 11+29
= x = 40
b/ ( x + 5 ) : 3 - 11 = 4
= ( x + 5 ) : 3 = 4+11
= ( x + 5 ) : 3= 15
= ( x + 5 ) = 15 x 3
= ( x + 5 ) = 45
= x = 45-5
= x = 40
c/ 231 + ( 312 - 2x ) = 531
= 312 - 2x = 531-231
= 312 - 2x = 300
= 2x = 312 - 300
= 2x = 12
= x = 12:2
=x = 6
Bài 10B :
a/ ( 50 - x ) + 12 = 31
= 50-x = 31 - 12
= 50 -x = 19
= x = 50 - 19
= x = 31
b/ 75 : ( x - 2 ) + 4 = 7
= 75 : ( x- 2) = 7-4
= 75 : ( x -2 ) = 3
= x-2 = 75 : 3
= x -2 = 25
= x = 25+2
= x = 27
c/ 125 - 3 ( x + 3 ) = 65
= 3 ( x + 3 ) = 125 -65
= 3 ( x + 3 ) = 60
= x+3 = 60 :3
= x +3 = 20
= x = 20-3
= x = 17
`(x-29)-11=0`
`x-29=0+11`
`x-29=11`
`x=11+29`
`x=40`
_______________________
`(x+5):3-11=4`
`(x+5):3=4+11`
`(x+5):3=15`
`x+5=15 . 3`
`x+5=45`
`x=45-5`
`x=40`
_________________________
`231+(312-2x)=531`
`312-2x=531-231`
`312-2x=300`
`2x=312-200`
`2x=12`
`x=12:2`
`x=6`
_______________________
`(50-x)+12=31`
`50-x=31-12`
`50-x=19`
`x=50-19`
`x=31`
__________________
`75:(x-4)+4=7`
`75:(x-2)=7-4`
`75:(x-2)=3`
`x-2=75:3`
`x-2=25`
`x=25+2`
`x=27`
___________________
`125-3.(x+3)=65`
`3.(x+3)=125-65`
`3.(x+3)=60`
`x+3=60:3`
`x+3=20`
`x=20-3`
`x=17`
2\7 - 3\8 + 11\7 + 1\3 + 1\7 - 5\8
= ( 2/7 + 11/7+ 1/7 ) + ( -3/8 -5/8 ) + 1/3
= 2+11+1 /7 + ( -3-5)/8 + 1/3
= 14/7 -8/8 +1/3
= 14:7 / 7: 7 - 1 +1/3
= 2 - 1 + 1/3
= 1+1/3
= 4/3
`3x +x = 6.4`
`3x + x = 24`
`=> 4x = 24`
`x =24 :4`
`x=6`
Vậy `x=6`
_________________________
`6x+2x=8.7`
`6x+2x=56`
`(6+2)x=56`
`8x=56`
`x=56:8`
`x=7`
Vậy `x=7`
a) 3x+x=6.4
x(3+1)=24
x4 =24
x =24:4
x =6
b) 6x+2x=8.7
x(6+2)=56
x8 =56
x =56:8
x =7
(tick cho mình nhé)
`x : 4/8 = 13/(-19) + 8/15`
`x: 1/2 = -13/19 + 8/15`
`x:1/2=-43/285`
`x=-43/285 xx 1/2`
`x=-43/570`
Vậy `x=-43/570`
x : 4/8 = 13/-19 + 8/15
x : 4/8 = -347/285
x = -347/285 x 4/8
x = -1388/2280
x = -694/1140
x = -347/570