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\(xxx+xx+x+x=992\)
\(111x+11x+x+x=992\)
\(x\times\left(111+11+1+1\right)=992\)
\(x\times124=992\)
\(x=992\div124\)
\(x=8\)
\(\dfrac{x}{5}=\dfrac{26}{65}\)
\(\Leftrightarrow65x=130\)
\(\Leftrightarrow x=2\)
\(\dfrac{3}{x}=\dfrac{51}{85}\)
\(\Leftrightarrow51x=255\)
\(\Leftrightarrow x=5\)
`x/5=26/65`
`65xx x=5xx26`
`65xx x=130`
`x=130:65=2`
`3/x=51/85`
`51xx x=3xx85`
`51xx x=255`
`x=255:51=5`
A) AB x X = ABAB => X = ABAB : AB = 101
B) X x A = AA => X = AA : A = 11
C) ABC x X = ABCABC => X = ABCABC : ABC = 1001
D) AB0AB0 : X = AB => X = AB0AB0 : AB = 10010
Các câu sau bạn tự làm nhé . Nhớ Tk cho mình nha Ok !
a, x * a = aa
x = aa : a
x = 11
b, ab * x = abab
x = abab : ab
x = 101
c, abc * x = abcabc
x = abcabc : abc
x = 1001
d, xx + x + 5 = 125
x*(11 + 1) + 5 = 125 - 5
x*12 = 120
x = 120 : 12
x = 10
e, xxx + xx + x + x = 992
x*(111 + 11 + 1 + 1) = 992
x*124 = 992
x = 992 : 124
x = 8
f, 4725 + xxx + xx + x = 54909
x*(111+11+1) = 54909 - 4725
x*123 = 50184
x = 50184 : 123
x = 408
g, xxx - xx -x - 25 = 4430
x*(111-11-1) = 4430 + 25
x*99 = 4455
x = 4455 : 99
x = 45
h, xxx + xx + x + x + x + 1 = 1001
x*(111 + 11 + 1 + 1 + 1) = 1001 - 1
x* 125 = 1000
x = 1000 : 125
x = 8
Chúc bạn học tốt
b) XXX + XX + X + X = 992
X x 111 + X x 11 + X x 2 = 992
X x (111 + 11 + 2) = 992
X x 124 = 992
X = 992 : 124 = 8
a, \(\overline{xx}+x+5=125\)
\(x\times11+x=120\)
\(x\left(1+11\right)=120\)
\(x=120\div12\)
\(x=10\)
Vậy x = 10
\(\overline{xxx}+\overline{xx}+x+x=992\)
\(x\times111+x\times11+x\times2=992\)
\(x\left(111+11+2\right)=992\)
\(x=992\div124\)
\(x=8\)
Vậy x = 8
\(4725+\overline{xxx}+\overline{xx}+x=54909\)
\(x\times111+x\times11+x=50184\)
\(x\left(111+11+1\right)=50184\)
\(x\times123=50184\)
\(x=408\)
Vậy x = 408
b, \(\overline{xxx}-\overline{xx}-x-25=4430\)
\(x\times111-x\times11-x=4455\)
\(x\left(111-11-1\right)=4455\)
\(x=4455\div99\)
\(x=45\)
Vậy x = 45
\(\overline{xxx}+\overline{xx}+x+x+x+1=1001\)
\(x\times111+x\times11+x\times3=1000\)
\(x\left(111+11+3\right)=1000\)
\(x=1000\div125\)
\(x=8\)
Vậy x = 8
\(35655-\overline{xxx}-\overline{xx}-x=5274\)
\(x\times111+x\times11+x=30381\)
\(x\left(111+11+1\right)=30381\)
\(x=30381\div123\)\
\(x=247\)
Vậy \(x=247\)
a)\(\Leftrightarrow\)\(x(27+30+43)=210500\)
\(\Leftrightarrow\)\(100x=210500\)
\(\Leftrightarrow\)\(x=2105\)
b)\(\Leftrightarrow\)\(x(128-12-16)=5208000\)
\(\Leftrightarrow\)\(100x=5208000\)
\(\Leftrightarrow\)\(x=52080\)
\(x\times27+x\times30+x\times43=210500\)
\(\Leftrightarrow x\times\left(27+30+43\right)=210500\)
\(\Leftrightarrow x\times100=210500\)
\(\Leftrightarrow x=2105\)
`a)` Thay `x=1;y=0` vào `A` có:
`A=(15:1+15xx1)+2009xx0`
`A=(15+15)+0=30`
`b)` Thay `x=1;y=0` vào `B` có:
`B=0:(119xx1+4512)+(756:1-0)`
`B=0+(756-0)=756`
THay `x=1;y=0` vào biểu thức `A` ta có :
`A=(15:1+15xx1)+2990xx0`
`A=(15xx1+15xx1)+2990xx0`
`A=(15xx2)+2990xx0`
`A=30+2990xx0`
`A=30+0=30`
Thay `x=1;y=0` vào biểu thức `B` ta có :
\(B=0:\left(119\times1+4512\right)+\left(756:1-0\right)\\ B=0:4631+756\\ B=0+756=756\)
6 x (236 - X) = 624
236 - x = 624 : 6 = 104
x = 236 - 104 = 132
b) X x a = aaa
X x a = 100a + 10a + a
X x a = 111a
Vậy x = 111
c) xx - x = 30
11 x X - X = 30
X x (11 - 1) = 30
X x 10 = 30
X = 30 : 10 = 3
Vậy x = 3