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a: \(=3\cdot\left(1.2+45\right)=3\cdot46.2=138.6\)
b: \(=0.5\left(8.9-7.6\right)=0.5\cdot1.3=0.65\)
c: =0,4+15=15,4
d: =17,8-15,2=2,6
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\(x:0,5+x\times0,5=0,75\)'
\(\Rightarrow x:\frac{5}{10}+x\times\frac{5}{10}=\frac{3}{4}\)
\(\Rightarrow\frac{10x}{5}+\frac{5x}{10}=\frac{3}{4}\)
\(\Rightarrow2x+\frac{5x}{10}=\frac{3}{4}\)
\(\Rightarrow\frac{40x}{20}+\frac{10x}{20}=\frac{15}{20}\)
\(\Rightarrow50x=15\Rightarrow x=0,3\)
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X/(0,3+0,5+0,7+0,8+0,5+0,2)=3,7
X/ 3 =3,7
=>X=3,7x3=11,1
\(\frac{x}{0,3}+\frac{x}{0,5}+\frac{x}{0,7}+\frac{x}{0,8}+\frac{x}{0,5}+\frac{x}{0,2}=3,7\)
\(\frac{10x}{3}+2x+\frac{10x}{7}+\frac{5x}{4}+2x+5x=3,7\)
\(\frac{280x}{84}+\frac{168x}{84}+\frac{120x}{84}+\frac{105x}{84}+\frac{168x}{84}+420x=3,7\)
\(\frac{1261.x}{84}=3,7\)
\(\Rightarrow1261x=310,8\)
\(\Rightarrow x=\frac{310,8}{1261}\)
\(x=\frac{1554}{6305}\)
Vậy \(x=\frac{1554}{6305}\)
P/S: Không chắc~
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\(x:0,5+x\) . \(\dfrac{1}{5}=1\dfrac{3}{5}\)
\(x :\)\(\dfrac{1}{2}+x.\dfrac{1}{5}=\dfrac{8}{5}\)
\(x . 2+x.\)\(\dfrac{1}{5}=\dfrac{8}{5}\)
\(x\)\((\)\(2+\)\(\dfrac{1}{5}\)\()\) \(=\)\(\dfrac{8}{5}\)
\(x.\)\(\dfrac{11}{5}=\dfrac{8}{5}\)
\(x=\)\(\dfrac{8}{5}:\dfrac{11}{5}\)
\(x=\)\(\dfrac{8}{11}\)
vậy \(x=\)\(\dfrac{8}{11}\)
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X x 3 + X : 0,5 = 12,5
X x 3 + X x 2 = 12,5
X x ( 3 + 2 ) = 12,5
X x 5 = 12,5
X = 12,5 : 5
X = 2,5
Vậy X = 2,5
~ Ai đi qua nhớ nha, ai mk thì mk lại! cảm ơn các bạn ~
X x 3 + X : 0,5 = 12,5
Xx3+Xx1/2=12,5
Xx(3+1/2)=12,5
Xx3,5=12,5
X=12,5:3,5
X=25/7