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29,5 - x x 0,25=20,5
x x 0,25=29,5 - 20,5
x x 0,25=9
x=9 : 0,25
x=36
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A=[20,5x0,25] + [18,225x5] : 0,05
=5,125 + 91,125 : 0,05
= 96,25 : 0,05
= 1925
~ học tốt ~
A = [20,5 x 0,25 ] + [18,225 x 5]: 0,05
A =5,125 + 91,125 :0,05
A = 5,125 + 14,56
A =19,685
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1a) x . 2,5 = 689
x = 689 : 2,5
x = 275,6
b) 8,5 . x = 646
x = 646 : 8,5
x = 76
c) x . 4 = 3429 : 54
x . 4 = 63,5
x = 63,5 : 4
x = 15,875
2a) 20,5 : 10 = 20,5 x 0,1
b) 27,6 : 0,01 > 127,99
c) 27,6 : 0,1 > 28
d) 37,58 ; 0,25 < 37,85 x 4
(sai thì thôi)
#Học tốt!!!
~NTTH~
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3,7 * x + x * 4,5 = 20,5
x * ( 3,7 + 4,5) = 20,5
x * 8,2 = 20,5
x = 20,5 : 8,2
x = 2,5
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a ) 36 * x + 12 ,67 = 489,67
36 * x = 489,67 - 12,67
36 * x = 477
x = 477 : 36 = 13,25
b ) x * 326,63 = 245,37
x = 245,37 : 326,63 = 0,7512169733....
c ) 29,5 * ( x + 10 ,25 ) = 376,125
x + 10 ,25 = 376,125 : 29,5
x + 10 ,25 = 12,75
x = 12,75 - 10,25 = 2,5
d ) 748 : (x - 31,72) = 13,6
x - 31,72 = 748 : 13,6
x - 31,72 = 55
x = 55 + 31,72 = 86,72
a, 36 * x + 12,67 = 489,67
36 * x = 489,67 - 12,67 = 477
x = 477 : 36 = 13,25
b, x * 326,63 = 245,37
x = 245,37 : 326,63 = 0,75
c, 29,5 * (x + 10,25) = 376,125
x + 10,25 = 376,125 : 29,5 = 12,75
x = 12,75 - 10,25 = 2,5
d, 748 : ( x - 31,72 ) = 13 ,6
( x - 31,72 ) = 748 : 13,6 = 55
x = 55 + 31,72 = 86,72
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17,8 x X = 360,05 - 93,05
17,8 x X = 267
X = 267 : 17,8
X = 15
29,5 x ( X + 10,25 ) = 376,125
X + 10,25 = 376,125 : 29,5
X + 10,25 = 12,75
X = 12,75 - 10,25
X = 2,5
748 : ( X - 31,72 ) = 13,6
X - 31,72 = 748 : 13,6
X - 31,72 = 55
X = 55 + 31,72
X = 86 , 72
207 : 31,6 = 6,55063291139
17,8 . x = 360,05 - 93,05
17,8 . x = 267
x = 267 : 17,8
x = 15
29,5 . (x + 10,25) = 376,125
(x + 10,25) = 376,125 : 29,5
x + 10,25 = 12,75
x = 12,75 - 10,25
x = 2,5
748 : (x - 31,72) = 13,6
(x - 31,72) = 748 : 13,6
x - 31,72 = 55
x = 55 + 31,72
x = 86,72
207 : 31,6 = 6,55063291139
Học tốt!!!
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29,5 x ( x + 10,25 ) = 376,125
=> x + 10,25 = 376,125 : 29,5
=> x + 10,25 = 12,75
=> x = 12,75 - 10,25
=> x = 2,5
748 : ( x - 31,72) = 13,6
=> x - 31,72 = 748 : 13,6
=> x - 31,72 = 55
=> x = 55 + 31,72
=> x = 86,72
\(29,5\left(x+10,25\right)=376,125\)
\(29,5x+302,375=376,125\)
\(29,5x=376,125-302,375\)
\(29,5x=y\)(y tự tìm)
\(x=\frac{y}{29,5}\)
29,5 - x * 0,25 = 20,5
x = (29,5-20,5):0,25
x =9:0,25
x =36
HT
\(29,5-0,25x=20,5\)
\(\Leftrightarrow0,25x=9\)
\(\Leftrightarrow x=9:0,25\)
\(\Leftrightarrow x=36\)
Vậy x = 36