20.21 x 35 + 2.012 x 250 + 201.2 x 3.9 + 20.12
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250 x 15 + 250 x 50 + 250 x 35.
= 250 x ( 15 + 50 + 35 ).
= 250 x 100
= 25000.
k mik nha!!
#Học tốt.
\(250\times15+250\times50+250\times35\)
\(=250\times\left(15+50+35\right)\)
\(=250\times100\)
\(=25000\)
#hoktot<3#
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![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: A = 98 x a + 2 x a + 118 x b - 18 x b
= (98+2) x a + (118-18) x b
= 100 x a + 100 x b
= 100 x (a+b)
= 100 x 240
= 24000
![](https://rs.olm.vn/images/avt/0.png?1311)
A=98 x a+118 x b+2 x a-18 x b
=(98+2) x a+(118-18) x b
=100 x a+100 x b
=100 x (a+b)
=100 x 20 x 12
=2000 x 12
=24000
![](https://rs.olm.vn/images/avt/0.png?1311)
x ∈ BC(15;35;42) và 250 < x < 850
Ta có BCNN(15;35;42) = 210
x ∈ {0;210;420;630;840;1050;...}
Vì và 250 < x < 850 nên x ∈ {420;630;840}
![](https://rs.olm.vn/images/avt/0.png?1311)
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- 35 - ( x+ 7 ) = 250 + 6( x- 93 )
<=> -35 - x - 7 = 250 + 6x - 558
<=> - 7x = -226
<=> x = 38
OK
-35-(x+7)=250+6*(x-93)
=>-35-x-7=250+6x-558
=>-42-x=6x-308
=>-42+308=x+6x
=>266=7x
=>x=266:7
=>x=38
k mh nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 84+16+216-10
= (16+216-10)+84
= 222+84 = 306
b) 20*12+20*21+67*20
\(20,21\times35+2,012\times250+201,2\times3,9+20,12\)
Sửa đề : \(20,12\times35+2,012\times250+201,2\times3,9+20,12\)
\(=20,12\times35+2,012\times25\times10+201,2\times3,9+20,12\times1\)
\(=20,12\times35+20,12\times25+20,12\times39+20,12\times1\)
\(=20,12\times\left(35+25+39+1\right)\)
\(=20,12\times\left(60+39+1\right)\)
\(=20,12\times\left(99+1\right)\)
\(=20,12\times100\)
\(=2012\)
Sửa đề: 20,12x35+2,012x250+201,2x3,9+20,12
=20,12x35+20,12x25+20,12x39+20,12
=20,12x(35+25+39+1)
=20,12x100=2012