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100 x 6 x 9 x 50 x 200 x 900 x 1000 x 2000 x 900 x 10 = 874800000000000000000
2 - ( 2/8 + x - 173/24 ) : 50/3 = 0
( 2/8 + x - 173/24 ) : 50/3 = 2 - 0
( 2/8 + x - 173/24 ) : 50/3 = 2
2/8 + x - 173/24 = 2 x 50/3
2/8 + x - 173/24 = 100/3
2/8 + x = 100/3 + 173/24
2/8 + x = 973/24
x = 973/24 - 2/8
x = 967/24
\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)\text{ : }\frac{50}{3}=0\)
\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)=0\text{ x }\frac{50}{3}\)
\(2-\left(\frac{2}{8}+x-\frac{173}{24}\right)=0\)
\(\frac{2}{8}+x-\frac{173}{24}=2-0\)
\(\frac{2}{8}+x-\frac{173}{24}=2\)
\(\frac{2}{8}+x=2+\frac{173}{24}=\frac{48}{24}+\frac{173}{24}\)
\(\frac{2}{8}+x=\frac{221}{24}\)
\(x=\frac{221}{24}-\frac{2}{8}=\frac{221}{24}-\frac{6}{24}\)
\(x=\frac{215}{24}\)
(x+1)+(x+2)+...x+28=155
=> x + 1 + x + 2 + ... + x + 28 =155
=> 28x + (1 + 2 + 3 + ... + 28) =155
=> 28x + 28.(28+1):2 = 155
=> 28x + 406 = 155
=> 28x = 155 - 406 = -251
=> x = -251/28
Ta có:
(x+1)+(x+2)+...x+28=155
<=> x + 1 + x + 2 + ... + x + 28 =155
<=> 28x + (1 + 2 + 3 + ... + 28) =155
<=> 28x + 28.(28+1):2 = 155
<=> 28x + 406 = 155
<=> 28x = 155 - 406 = -251
=> x = \(-\frac{251}{28}\)
hok tốt
a, 2 : y = 1 : 3
2 : y = \(\dfrac{1}{3}\)
y = 2 : \(\dfrac{1}{3}\)
y = 6
b, 24,68 \(\times\) y - y \(\times\) 12,34 = 24,68
y \(\times\) ( 24,68 - 12,34) = 24,68
y \(\times\) 12,34 = 24,68
y = 24,68 : 12,34
y = 2
17 x 42 + 67 x 58 - 50 x 28
= 714 + 3886 - 1400
= 4600 - 1400
= 3200
50 * 2 = 100
50x2=100