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TL :
5 . 5 : 25 . 5 . 5 . 5 : 125 - 1
= 52 : 25 . 53 : 125 - 1
= 1 . 53 : 125 - 1
= 125 : 125 - 1
= 1 - 1
= 0
_HT_
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a ) 2 x 3 x 5 x 7
= ( 2 x 5 ) x 3 x 7
= 10 x 21
= 210
b ) 50 x 9 x 9 x 2
= ( 50 x 2 ) x 9 x 9
= 100 x 81
= 8100
c ) 13 x 25 x 3 x 4
= ( 25 x 4 ) x 13 x 3
= 100 x 39
= 3900
d ) 7 x 125 x 7 x 8
= ( 125 x 8 ) x 7 x 7
= 1000 x 49
= 49000
e ) 25 x 32 x 125
= 800 x 125
= 100000
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\(a,\left(x\times5-19\right)+\left(x\times3+24\right)=125\)
\(x\times5-19+x\times3+24=125\)
\(x\times5+x\times3+\left(-19+24\right)=125\)
\(x\left(5+3\right)-19+24=125\)
\(x\times8-19=125-24\)
\(x\times8-19=101\)
\(x\times8=120\)
\(x=120\div8\)
\(x=15\)
Câu b) thì em tự giải nhé!
a. (X x 5 - 19) + (X x 3 - 24) = 125
X x 5 - 19 + X x 3 -24 = 125
X x (5 + 3) - 19 - 24 = 125
X x 8 - 19 = 125 + 24
X x 8 - 19 = 149
X x 8 = 149 + 19
X x 8 = 168
X = 168 : 8
X = 21. Vậy x = 21
b. 9675 - (x + x) = 8341
9675 - 2 x X = 8341
2 x X = 9675 - 8341
2 x X = 1334
X = 1334 : 2
X = 667. Vậy x = 667
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x + xx + 5 = 125
x + xx = 125 - 5
x + xx = 120
x + x * 11 = 120
x * ( 11 + 1 ) = 120
x * 12 = 120
x = 120 : 12
x= 10
Vậy x = 10
x + xx + 5 = 125
x + xx = 125 - 5
x + xx = 120
x + X x 2 = 120
X x 3 = 120
X = 120 : 3
X = 40
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\(125-x^25=50\Leftrightarrow5x^2=75\Leftrightarrow x^2=15\Leftrightarrow x=\pm\sqrt{15}\)
\(45+x:8=75\Leftrightarrow x:8=30\Leftrightarrow x=240\)
\(\left(x-5\right)6=48\Leftrightarrow6x-30=48\Leftrightarrow6x=18\Leftrightarrow x=3\)
12345768899989765253+135792468101222222355555555555555555666789000000=?
X : 5 = 125 : 5
X : 5 = 25
X = 25 x 5
X = 125
X : 5 = 125 :5
x : 5 = 25
x =25*5
x = 125