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\(\dfrac{x-3}{13}+\dfrac{x-3}{14}=\dfrac{x-3}{15}+\dfrac{x-3}{16}\)
\(\Leftrightarrow x-3=0\)
hay x=3
a)x+13=32-76
x+13=(-44)
x=-31
b)(-15)+x=43
x=43+15
x=58
c)8-(3-7)
=8+4
=12
d)(-5)-(9-12)
=(-5)+3
=-2
t tôi nha
1)
a) x + 13 = 32 - 76
x + 13 = -44
x = ( -44 ) - 13
x = -57
b) ( -15 ) + x = ( -14 ) - ( -57 )
( -15 ) + x = 43
x = 43 - ( -15 )
x = 58
2)
a) 8 - ( 3 - 7 ) = 8 - ( -4 ) = 12
b) ( -5 ) - ( 9 - 12 ) = ( -5 ) - ( -3 ) = -2
A,-3/-7+5/19+-4/7
=(-3/-7+-4/7)+5/19
=-1/7+5/19=16/133
B,-13/24+-5/24+7/21
=-3/4+7/21=-5/12
C,-5/13+(-8/13+1)
=(-5/13+-8/13)+1
=-1+1=0
D,2/3+(3/8+-2/3)
=(2/3+-2/3)+3/8
=0+3/8=3/8
E,(-3/4+5/8)+-1/8
=-1/8+1/8=0
a) 40 và 60
Ta có Ư(40)\(\in\){1;2;4;5;6;8;10;16;20}
Ư(60)\(\in\){1;2;3;4;5;6;10;12;15;20;30)
ƯC(40;60)\(\in\){1;2;3;4;5;6;10;20}
Trong đó,20 là ƯCLN.Vậy ƯCLN(40;60)\(\in\){20}
b)
72-7.(13-x)=14
=>7.(13-x)=72-14
=>7.(13-x)=58
=>13-x=58:7
=>13-x=\(\dfrac{58}{7}\)
\(=>x=13-\dfrac{58}{7}\)
\(=>x=\dfrac{33}{7}\)
Vậy ................
\(72-7\left(13-x\right)=14\)
\(7\left(13-x\right)=58\)
\(13-x=\dfrac{58}{7}\)
\(x=13-\dfrac{58}{7}\)
\(x=\dfrac{91}{7}-\dfrac{58}{7}\)
\(x=\dfrac{33}{7}\)
`72-7(13-x)=14`
`=>7(13-x)=72-14`
`=>7(13-x)=58`
`=>13-x=58:7`
`=>13-x=58/7`
`=>x=13-58/7`
`=>x=33/7`
\(-4.\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(-8x-36+8x-3-x-13=0\)
\(-x-52=0\)
\(x=-52\)
k mk nha
thank you very much