7.8 x 0,35 + 0.35 x 2.2
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7,8\cdot0,35+0,35\cdot2,2\)
\(\Leftrightarrow0,35\left(7,8+2,2\right)\)
\(\Leftrightarrow0,35\cdot10\)
\(\Leftrightarrow3,5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.=9.3\times\left(6.7+3.3\right)\)
\(=9.3\times10\)
\(=93\)
\(b.=0.35\times\left(7.8+2.2\right)\)
\(=0.35\times10\)
\(=3.5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
7.8 x 0.35 +0.05 x 7 + 2.1 x 0.35
=(7,8+2,1+0.05)x 0.35
=9,95 x 0.35
=3.4825
học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-\dfrac{3}{7}\times0,35-\dfrac{3}{7}\times0,65\)
\(=-\dfrac{3}{7}\times\left(0,35+0,65\right)\)
\(=-\dfrac{3}{7}\times1\)
\(=-\dfrac{3}{7}\)
-3/7 x 0.35 - 3/7 x 0.65
= 3/7 x ( -0.35 ) + 3/7 x ( -0.65 )
= 3/7 x -(0.35 + 0.65 )
= 3/7 x -1
= -3/7
![](https://rs.olm.vn/images/avt/0.png?1311)
7,8 x 0,35 + 0,35 x 1,2 + 0,35
=7,8 x 0,35 + 0,35 x 1,2 + 0,35 x 1
=0,35 x ( 7,8 + 1,2 +1)
=0,35 x 10
=3,5
![](https://rs.olm.vn/images/avt/0.png?1311)
7,8*0,35+0,35*2,1+0,35*0,1=(7,8+2,1+0,1)*0,35
=10*0,35
=3,5
7,8x0,35+0,35x2,1+0,35x0,1=(7,8+2,1+0,1)x0,35
=10x0,35
=3,5
k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
7,8 x 0,35 + 0,35 x 2,2 = 0,35 x (7,8 + 2,2) = 0,35 x 10 = 3,5
4,7 x 5,5 - 4,7 x 4,5 = 4,7 x(5,5 - 4,5) = 4,7
7,8 x 0,35 + 0,35 x 2, 2
= 0,35 x ( 7, 8 + 2,2 )
= 0,35 x 10
= 35
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