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x : 4,37 = 5,6 ( dư 1,53 )
x = 5,6 x 4,37 + 1,53
x = 24,472 + 1,53
x = 26,002
x : 4,37 = 5,6 ( dư 1,53 )
x = 5,6 . 4,37 + 1,53
x = 26,002
\(1,\)
\(a,1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}\)
\(=\frac{81}{81}+\frac{27}{81}+\frac{9}{81}+\frac{3}{81}+\frac{1}{81}\)
\(=\frac{81+27+9+3+1}{81}\)
\(=\frac{121}{81}\)
\(=1\frac{40}{81}\)
\(b,37,25+4,7.2,3-9,8\)
\(=37,25+10,81-9,8\)
\(=38,26\)
\(2,\)
\(a,x:4,37=5,6\left(dư1,53\right)\)
\(x=5,6.4,37+1,53\)
\(\Rightarrow x=26,002\)
\(b,13,5.\left(x:5,6\right)=36,45\)
\(\left(x:5,6\right)=36,45:13,5\)
\(x:5,6=2,7\)
\(x=2,7.5,6\)
\(\Rightarrow x=15,12\)
a) 0,125 x 6,135 x 24 = 0,125 x 24 x 6,135
= 3 x 6,135
= 18,405
b, 5 m2 7 dm2 + 2,6 m2 + 3,33 m2 = 5,07 m2 + 2,6 m2 + 3,33 m2
= (5,07 m2 + 3,33 m2) + 2,6 m2
= 8,4 m2 + 2,6 m2
= 11 m2
~Học tốt~
a) \(210:x=2,1:0,25=8,4\)
\(x=210:8,4=25\)
b) \(x.2+x.0,5=6,25\)
\(2,5x=6,25\)
\(x=6,25:2,5=2,5\)
c) \(x:0,25-x=15,6\)
\(3x=15,6\)
\(x=5,2\)
d) \(x:12,5=3,75.4=15\)
\(x=15.12,5=187,5\)
e) \(x.12,6-x.5,6=42\)
\(7x=42\)
\(x=6\)
g) \(x:0,1-x:4-x.0,75=2,25\)
\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)
\(9x=2,25\)
\(x=0,25\)
a. (6,24+1,26):0,75
= 7,5 : 0,75 = 10
b. 30,8 - 6,25 x 14,4 :3
= 30,8 - 9 :3
= 30,8 - 3 = 27,8
Tìm x
3,75 : x = 15 : 10
3,75 : x = 1,5
x = 3,75 : 1,5
x = 2,5
3,2 x X = 22,4 x 8
3,2 x X = 179,2
X = 179,2 : 3,2
X = 56
\(b) x: 4,37 = 5,6 ( dư 1,53 )\)
\(x= 5,6 x 4,37 + 1,53\)
\(x= 24,472 + 1,53\)
\(x= 26,002\)
a) 3,75 x X + 6,25 x X = 20
=> \(x\) x ( 3,75 + 6,25 ) = 20
\(x\) x 10 = 20
\(x\) = 20 : 10
\(x\)= 2