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Bài 1:
a: \(=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{12}+\dfrac{1}{12}-\dfrac{1}{17}\)
=1/3-1/17
=4/51
b: \(=\left(2+3+4+...+23\right)+0.3\cdot22\)
=(23+2)*(23-2+1)/2+6,6
=275+6,6
=281,6
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\(1,\)
\(a,1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}\)
\(=\frac{81}{81}+\frac{27}{81}+\frac{9}{81}+\frac{3}{81}+\frac{1}{81}\)
\(=\frac{81+27+9+3+1}{81}\)
\(=\frac{121}{81}\)
\(=1\frac{40}{81}\)
\(b,37,25+4,7.2,3-9,8\)
\(=37,25+10,81-9,8\)
\(=38,26\)
\(2,\)
\(a,x:4,37=5,6\left(dư1,53\right)\)
\(x=5,6.4,37+1,53\)
\(\Rightarrow x=26,002\)
\(b,13,5.\left(x:5,6\right)=36,45\)
\(\left(x:5,6\right)=36,45:13,5\)
\(x:5,6=2,7\)
\(x=2,7.5,6\)
\(\Rightarrow x=15,12\)
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2,3 x 5 + 2,3 x 4 + 2,3
= 2,3 x ( 5 + 4 + 1 )
= 2,3 x 10
=23
4,3 x 4 + 0,43 x 10 - 4,3 x 2
= 4,3 x 4 + 4,3 - 4,3 x 2
= 4,3 x ( 4 + 1 - 2 )
= 4,3 x 3
= 12,9
câu còn lại tương tự nha
2,3 x 5 + 2,3 x 4 + 2,3
= 2,3 x ( 5+4+1 )
= 2,3 x 10
= 23
4,3 x 4 + 0,43 x10 - 4,3 x 2
= 4,3 x 4 + 4,3 - 4,3 x 2
= 4,3 x ( 4+1-2)
= 4,3 x 1
= 4,3
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 3,25 = 9,68 - 6,43
x + 3,25 = 3,25
x = 3,25 - 3,25
x = 0
x - 7,5 = 3,9 + 2,3
x - 7,5 = 6,2
x = 6,2 + 7,5
x =13,7
x + 3,25 = 9,68 - 6,43
x + 3,25 = 3,25
x = 3,25 - 3,25
x = 0
x - 7,5 = 3,9 + 2,3
x - 7,5 = 6,2
x = 6,2 + 7,5
x =13,7
mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,2,3:0,25+7,7.4\\ =2,3.4+7,7.4\\ =\left(2,3+7,7\right).4=10.4=40\\ b,4,2.8+5,8:0,125\\ =4,2.8+5,8.8\\ =\left(4,2+5,8\right).8=10.8=80\\ c,3,4.4+5,6:0,25+4\\ =3,4.4+5,6.4+4\\ =\left(3,4+5,6+1\right).4=10.4=40\\ d,4:0,2+12:0,5+1,2:0,25\\ =4.5+12.2+1,2.4\\ 4.5+6.4+1,2.4\\ =4\left(5+6+1,2\right)\\ =4.12,2=48,8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
9,5 x 4,7 + 9,5 x 4,3 + 9,5 x 1
= 9,5 x (4,7 + 4,3 + 1)
= 9,5 x 10
= 95
= 9,5 x (4,7 + 4,3 ) + 9,5
= 9,5 x 9 + 9,5
= 85,5 + 9,5
= 95
nhớ tích cho mình nha mình cảm ơn rất nhìu
6,43x(4,7-4,3)+5,6:4+7,5
=6,43 x 0,4+1,4+7,5
=2,572+1,4+7,5
=11,472
48,24 :12+75,25:25
=4,02+3,01
=7,03
173,8-45,15:15x2,3
=173,8-3,01x2,3
=173,8-6,923
=166,877