4=1/25,4=1/35
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a ) 0,783 : 87 = 0,009
86,76 : 12 = 7,23
266,22 : 34 = 7,83
483 : 35 = 13,8
b ) 127 : 25,4 = 5
26,52 : 3,9 = 6,8
19,04 : 5,6 = 3,4
270: 10,8 = 25
a)=(1574,8:25,4)+72x0,5
=62+36
=98
b)=(375,42-207,6)+(95,8x0,1)
=167,82+9,58
=177,4
A]0,783:87=0,009
266,22:34=7,83
483:35=19,32
B]127:25,4=5
19,04:5,6=3,4
270:10,8=25
\(a.\) \(25,4-\frac{1}{4}\div x+1250\%=37,5\)
\(25,4-0.25\div x+12,5=37,5\)
\(25,4-0,25\div x=37,5-12,5\)
\(25,4-0,25\div x=25\)
\(0,25\div x=25,4-25\)
\(0,25\div x=0,4\)
\(x=0,25\div0,4\)
\(x=0,625\)
\(b.\)\(3\frac{1}{8}\div\left(\frac{2}{5}-x\right)\times\frac{8}{25}=3\)
\(\frac{3\times8+1}{8}\div\left(\frac{2}{5}-x\right)=3\div\frac{8}{25}\)
\(\frac{25}{8}\div\left(\frac{2}{5}-x\right)=\frac{75}{8}\)
\(\frac{2}{5}-x=\frac{25}{8}\div\frac{75}{8}\)
\(\frac{2}{5}-x=\frac{25}{8}\times\frac{8}{75}\)
\(\frac{2}{5}-x=\frac{1}{3}\)
\(x=\frac{2}{5}-\frac{1}{3}=\frac{6}{15}-\frac{5}{15}\)
\(x=\frac{1}{15}\)
a)25,4-\(\frac{1}{4}\): x +1250%=37,5
25,4 - 0,25 : x + 12,5 = 37,5
25,4 - 0,25 : x =37,5 -12,5
25,4 - 0,25 : x = 25
0,25 : x = 25,4 -25
0,25 : x = 0,4
x = 0,25;0,4
x = 0,625
b) \(3\frac{1}{8}:\left(\frac{2}{5}-x\right)\times\frac{8}{25}=3\)
\(3,125:\left(0,4-x\right)\times0,32=3\)
\(3,125:\left(0,4-x\right)=3:0,32\)
\(3,125:\left(0,4-x\right)=9,375\)
\(0,4-x=3,125:9,375\)
\(0,4-x=\frac{1}{3}\)
\(x=0,4-\frac{1}{3}\)
\(x=\frac{1}{15}\)
a) 46 : 12 + 8 : 12
= (46 + 8) : 12
= 54 : 12
= 9/2
b) 17,89 : 25 - 4,89 : 25
= (17,89 - 4,89) : 25
= 13/25
c) 25,4 : 2,5 : 4
= (25,4 : 2,5) : 4
= 10 : 4
= 5/2
d) 2 : 28 × 7
= (2 × 7) : 28
= 14 : 28
= 1/2