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x*12,5 -x +x *2,75=1050
x*12,5 -x*1+x*2,75=`1050
x*(12,5-1+2,75)=1050
x*14,25=1050
x=1050:14,25
x= 73,68421053
a. 12,5 - \(x\) = \(x\) + 12
\(x\) + 12 + \(x\) = 12,5
\(x\) x 1 + \(x\) x 1 = 12,5 - 12
\(x\) x (1 + 1) = 0,5
\(x\) x 2 = 0,5
\(x\) = 0,5 : 2
\(x\) = 0,25
b, 8 \(\times\) \(x\) + 3 \(\times\) \(x\) + 2 \(\times\) \(x\) = 20
\(x\) \(\times\) (8 + 3 + 2) =20
\(x\) \(\times\) 13 = 20
\(x\) = 20 : 13
\(x\) = \(\dfrac{20}{13}\)
x - 40% . x = 36 30% . x + x = 52
=> x - 2/5.x = 36 => 3/10 .x + x = 52
=> x(1 - 2/5) = 36 => (3/10 + 1).x = 52
=> x. 3/5 = 36 => 13/10.x = 52
=> x = 36 : 3/5 => x = 52 : 13/10
=> x = 60 => x = 40
X = 0
Y = 6
4 x X + X x Y + y
= 4 x 0 + 0 x 6 + 6
= 0 + 0 + 6
= 6
\(410-\left(5.x+42.x+x.3\right)=60\)
\(\Leftrightarrow\left(5.x+42.x+3.x\right)=410-60\)
\(\Leftrightarrow5.x+42.x+3.x=350\)
\(\Leftrightarrow\left(5+42+3\right).x=350\)
\(\Leftrightarrow50x=350\)
\(\Leftrightarrow x=350:50\)
\(\Leftrightarrow x=7\)
Vậy \(x=7.\)
\(410-\left(5x+42x+3x\right)=60\)
\(410-50x=60\)
\(50x=410-60\)
\(50x=350\)
\(x=7\)
\(13,44\cdot x-\left(1,6+x\right)\cdot0,5-3,7\cdot\left(x-0,9\right)=13,618\)
\(13,44\cdot x-0,5\cdot x-0,8-3,7\cdot x-3,33=13,618\)
\(x\left(13,44-0,5-3,7\right)-\left(0,8+3,33\right)=13,618\)
\(x\cdot9,24-3,41=13,618\)
\(x\cdot9,24=13,618-3,41\)
\(x\cdot9,24=10,208\)
\(x=10,208\div9,24\)
\(x\approx1,104\)
\(x\) x 12,5 x \(x\) x 10 = 36,4
=> \(x\)2 x 12,5 x 10 = 36,4
=> \(x\)2 x 125 = 36,4
=> \(x\)2 = 36,4 : 125
=> \(x\)2 = 0,2912
=> \(x\)= \(\sqrt{0,2912}\) hoặc \(-\sqrt{0,2912}\)