20,10 x 35 -19,45 x 65 +20,10 x 65 -19,45 x 35
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= 35*(20,10-19,45)+65*(20,10-19,45)
=35*0,65+65*0,65
=0,65*(35+65)
=0,65*100
=65
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35 x 34 + 35 x 65 + 65 x 75 + 65 x 45
= ( 35 x 34 + 35 x 65 ) + ( 65 x 75 + 65 x 45 )
= 35 x ( 34 + 65 ) + 65 x ( 75 + 45 )
= 35 x 99 + 65 x 120
= 3465 + 7800
= 11265
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2,5.x+x.1,5=20,10
=> x.(2,5+1,5)=20,10
=> x.4=20,10
=> x=20,10:4
=> x=5,025
2,5 . x + x . 1,5 = 20,10
x . (2,5 + 1,5) = 20,10
x. 4 = 20,10
x = 20,10 : 4
x = 5,025
![](https://rs.olm.vn/images/avt/0.png?1311)
= 65 x ( 121 + 11) - 35 x ( 17 + 115 )
= 65 x 132 - 35 x 132
= ( 65 - 35) x 132
= 30 x 132
= 3960
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![](https://rs.olm.vn/images/avt/0.png?1311)
35 x 26 + 65 x 59 + 34 x 35 + 51 x 65
= 35 x ( 26 + 34 ) + 65 x ( 51 + 59 )
= 35 x 60 + 65 x 110
= 2100 + 7150
= 9250
35 x 26 + 65 x 59 + 34 x 35 + 51 x 65
= 35 (26 + 34) + 65 (59 + 51)
= 35 x 60 + 65 x 110
= 2100 + 7150
= 9250
20,10x35-19,45x65+20,10x65-19,45x35
=(35+65)x20,10+(35+65)x19,45
=100x20,10-100x19,45
=100x(20,10-19,45)
=100x0,65=65