) X x 27 + 13 x X = 170 x 20
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1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
a) 13 - ( -20 ) + x = 80 : 2
33 + x = 40
x = 40 - 33
x = 7
b) -13 + ( -20 ) + x = ( - 490 ) + 27
- 33 + x = -463
x = -463 - ( -33 )
x = -430
a) 13-(-20)+x=80:2
13+20+x=40
33+x=40
x=40-33
x=7
b) -13+(-20)+x=(-490)+27
-33+x=-463
x=-463+33
x=-430
\(a,2\times31\times12+4\times6\times42+8\times27\times3\)
\(=24\times31+24\times42+24\times27\)
\(=24\times\left(31+42+27\right)\)
\(=24\times100\)
\(=2400\)
\(b,583.931+69.\left(170+583\right)+31.170\)
\(=583.931+69.170+69.583+31.170\)
\(=583.\left(931+69\right)+170.\left(69+31\right)\)
\(=583.1000+170.100\)
\(=583000+17000\)
\(=600000\)
\(c,732.976+24.\left(680+732\right)+76.680\)
\(=732.976+24.680+24.732+76.680\)
\(=732.\left(976+24\right)+680.\left(24+76\right)\)
\(=732.1000+680.100\)
\(=732000+68000\)
\(=800000\)
Học tốt
a)x-13=-5+8
x-13=3
x=3+13
x=16 hoặc -10
b)|x-2|=|-5|
|x-2|=5|
|x|=5+2
|x|=7
x=7 hoặc -7
c)25-(30+x)=x-(27-8)
25-(30+x)=x-19
...còn lại mình bó tay
d)bó tay luôn
\(\dfrac{x-187}{13}+\dfrac{x-170}{15}+\dfrac{x-149}{17}+\dfrac{x-124}{19}=10\)
`<=>(x-187)/13+(x-170)/15+(x-149)/17+(x-124)/19-10=0`
`<=>(x-187)/13-1+(x-170)/15-2+(x-149)/17-3+(x-124)/19-4=0`
`<=>(x-200)/13+(x-200)/15+(x-200)/17+(x-200)/19=0`
`<=>(x-200)(1/13+1/15+1/17+1/19)=0`
`<=>x-200=0(1/13+1/15+1/17+1/19>0)`
`<=>x=200`
\(=>\left(\dfrac{x-187}{13}-1\right)+\left(\dfrac{x-170}{15}-2\right)+\left(\dfrac{x-149}{17}-3\right)+\left(\dfrac{x-124}{19}-4\right)=0\)\(< =>\left(\dfrac{x-187}{13}-\dfrac{13}{13}\right)+\left(\dfrac{x-170}{15}-\dfrac{30}{15}\right)+\left(\dfrac{x-149}{17}-\dfrac{51}{17}\right)+\left(\dfrac{x-124}{19}-\dfrac{76}{19}\right)=0\)
\(< =>\left(\dfrac{x-200}{13}\right)+\left(\dfrac{x-200}{15}\right)+\left(\dfrac{x-200}{17}\right)+\left(\dfrac{x-200}{19}\right)=0\)
\(< =>\left(x-200\right)\left(\dfrac{1}{13}+\dfrac{1}{15}+\dfrac{1}{17}+\dfrac{1}{19}\right)=0\)
\(< =>x-200=0\)
<=>x=200
Bui Bao Ngoc oi! phan a,la (x+1)/10 hay x+(1/10)?
cac phan khac nua!
X x 27 + 13 x X = 3400
X x ( 27 + 13 ) = 3400
X x 40 = 3400
X = 3400 : 40
X = 85