A)1/4+x+x+21,5=36,5
B)3/5×x+x×2+40=53
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a ) 1/4 x X x 2 = 15
X x 2 = 1/4 x 15
Xx2=3,75
x= 3,75 : 2
x= 1,875
a) 1/4.x+x=36,5-21,5
1/4.x+x=15
x.(1/4+1)=15
x.5/4 =15
x =15:5/4
x =12
b) 3/5.x+x.2=53-40
3/5.x+x.2=13
x.(3/5+2)=13
x.13/5 =13
x =13:13/5
x =5
A = 4 . 2 . 25 . 5 . 175
A = 22 . 2 . 52 . 5 . 52 . 7
A = 22+1 . 52+1+2 . 7
A = 23 . 55 .7
A = 175000
\(B=4^2-10^4:\left(50\cdot273-50\cdot73\right)\)
\(B=4^2-10^4:\left[50\cdot\left(273-73\right)\right]\)
\(B=4^2-10^4:\left(50\cdot200\right)\)
\(B=4^2-10^4:10^4=4^2-1=15\)
\(C=3\times53\times6+2\times9\times87-18\times40\)
\(C=18\times53+18\times87-18\times40\)
\(C=18\times\left(53+87-40\right)\)
\(C=18\times100=1800\)
a, 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
= 53 x (39-21) + 47 x (93-21)
=53 x 18 + 47 x 18
= (53 +47) x 18
=100 x 18
=1800
b,2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40
=24 x 53 + 24 x 87 - 24 x 40
=24 x (53+87-40)
=24 x 100
=2400
c,5 x 7 x 77 - 7 x 60 +49 x 25 -15 x 42.
=5 x 7 x 77 - 7 x 5 x 12 +49 x 5 x 5 - 5 x 3 x 42.
=5 x 539 - 84 x 5 +245 x 5 -5 x 126
=5 x (539 - 84 +245 -126)
=5 x 574
=2870
x + 21/40 = 53/40
x = 53/40 - 21/40
x = 32/40 = 4/5
34/35 : x = 17/5
x = 34/35 : 17/5
x = 2/7
`x + 3 / 4 xx 7 / 10 = 53 / 40`
`x + 21 / 40 = 53 / 40`
`x = 53 / 40 - 21 / 40`
`x = 32 / 40`
`x = 4 / 5`
____________________________
`( 2 / 5 + 4 / 7 ) : x = 17 / 5`
`( 14 / 35 + 20 / 35 ) : x = 17 / 5`
`34 / 35 : x = 17 / 5`
`x = 34 / 35 : 17 / 5`
`x = 34 / 35 xx 5 / 17`
`x = 2 / 7`
\(a.\frac{1}{4}+x+x+21,5=36,5\)
\(0,25+21,5+2x=36,5\)\(\)
\(21,75+2x\) \(=36,5\)
\(2x\) \(=36,5-21,75\)
\(x\) \(=14,72\div2=\frac{59}{8}\)
\(b.\frac{3}{5}\times x+x\times2+40=53\)
\(x\times(\frac{3}{5}+2)\) \(=53-40\)
\(x\times\frac{13}{5}\) \(=13\)
\(x\) \(=13\div\frac{13}{5}\)
\(x\) \(=5\)
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