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X2 + X = 15
X x 2 + X x 1 = 15
X x ( 2 + 1 ) = 15
X x 3 = 15
X = 15 : 3
X = 5
X3 + X = 20
X x 3 + X x 1 = 20
X x ( 3 + 1 ) = 20
X x 4 = 20
X = 20 : 4
X = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
TL :
( 15 x 15 ) : 2 x ( 15 x 15 ) : 2 x ( 15 x 15 ) : 2 + ( 0 + 1 + 2 + 2 + 3 + 45 ) x 0
= 0
=> vì : tất cả số nào nhân vs 0 đều = 0
_HT_
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37 x 18 - 9 x 14 + 100
=37*2*9-9*14+100
=74*9-9*14+100
=9*(74-14)+100
=9*60+100
=540+100
=640
15 x 2 + 15 x 3 + 15 x 5
=15*(2+3+5)
=15*10
=150
52 + 37 + 48 + 63
=(52+48)+(37+63)
=100+100
=200
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\(a,\left(3416+6584\right)+1025=11025\\ b,15\times\left(2+3+5\right)=150\)
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\(a,3416+1025+6584\\ =\left(3416+6584\right)+1025\\ =10000+1025\\ =11025\\ b,15\times2+15\times3+15\times5\\ =15\times\left(2+3+5\right)\\ =15\times10\\ =150\)
a,3416+1025+6584=(3416+6584)+1025=10000+1025=11025b,15×2+15×3+15×5=15×(2+3+5)=15×10=150
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1)240x15-80x6x3-60x4
=240x15-80x3x6-240x1
=240x15-240x6-240x1
=240x(15-6-1)
=240x8
=1920
2)150x5x3x6-15x11
150x5x6x3-15x10-150x0,2
=150x5x6x3-150x1-150x0,2
=150x(5+6+3-1-0,2)
=150x12,8
=1980
![](https://rs.olm.vn/images/avt/0.png?1311)
1111+2517536251673521735123517338276349-24546575643356435321=
15 x 2 + 15 x3 - 15 + 15 x 5=30+45-15+75=135