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7,5*x+x*3,5=39,93
(7,5+3,5)*x=39,93
11x=39,93
x=39,93/11
x=3,63. Vậy x=3,63
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13,5 * [ x : 5,6 ] = 36,45
x:5,6=36,45:13,5
x:5,6=2,7
x=2,7x5,6
x=15,12
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(x : 5.6 ) = 36.45 : 13.5
x : 5.6 = 2.7
x = 2.7 * 5.6
x = 15.12
nhanh nhất đó,ko bít mk có sai ko nhưng bạn
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Lời giải:
$y\times 3,5=22,19$
$y=22,19:3,5=6,34$
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$48,3-y\times 2,8=30,716$
$y\times 2,8=48,3-30,716=17,584$
$y=17,584:2,8=6,28$
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$y:5,7-5,6=12,5$
$y:5,7=12,5+5,6=18,1$
$y=18,1\times 5,7=103,17$
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\(1,\)
\(a,1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}\)
\(=\frac{81}{81}+\frac{27}{81}+\frac{9}{81}+\frac{3}{81}+\frac{1}{81}\)
\(=\frac{81+27+9+3+1}{81}\)
\(=\frac{121}{81}\)
\(=1\frac{40}{81}\)
\(b,37,25+4,7.2,3-9,8\)
\(=37,25+10,81-9,8\)
\(=38,26\)
\(2,\)
\(a,x:4,37=5,6\left(dư1,53\right)\)
\(x=5,6.4,37+1,53\)
\(\Rightarrow x=26,002\)
\(b,13,5.\left(x:5,6\right)=36,45\)
\(\left(x:5,6\right)=36,45:13,5\)
\(x:5,6=2,7\)
\(x=2,7.5,6\)
\(\Rightarrow x=15,12\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a/ y - 8,5 = 1,8 x 3,5
y - 8,5 = 6,3
y = 6,3 + 8,5
y = 14,8
b/ y : 1,5 = 23,4 + 4,8
y : 1,5 = 28,2
y = 28,2 x 1,5
y = 42,3