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a,X+X:3x4,5+X:2x7=252
X+Xx1,5+Xx7/2=252
Xx(1+1,5+7/2)=252
Xx6=252
X=42
b, (515,5x40-18)x(314:0,5xX)=17776
(20620-18)x(628xX)=17776
20602x(628xX)=17776
628 x X=17776:20602
ko bt nữa....
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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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\(a.\left[515,5\times40-18\right]-\left[314:0,5\times x\right]=17776\)
\(\left[20620-18\right]-\left[628\times x\right]=17776\)
\(20602-\left[628\times x\right]=17776\)
\(628\times x=20602-17776\)
\(628\times x=2826\)
\(x=2826:628\)
\(x=4,5\)
\(b.8\times x+125,75=325+\frac{75}{100}\)
\(8\times x+125,75=325+0,75\)
\(8\times x+125,75=325,75\)
\(8\times x=325,75-125,75\)
\(8\times x=200\)
\(x=200:8\)
\(x=25\)
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2 x 4,8 x 0,5 + 4 x 16 x 0,25 + 20 : 10 x 0,5
=(2 x0,5) x4,8 +(4 x0,25) x16 +2 x0,5
=1 x4,8+16+1
=4,8+16+1
=21,8
12,5 x3,14 x8 +16 x0,125 x1,57
=(12,5 x8 )x3,14 +8 x2x0,125x1,57
=100 x3,14 +(8 x0,125) x2 x1,57
=314 + 2x1,57
=314 +3,14
=317,14
tick nhiệt tình nha nhanh nhất nè
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x:0,125+x:0,25+x:0,5=30
=>x:(0,125+0,25+0,5)=30
=>x:0,875=30
x=30.0,875
x=26,25
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