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345x2-107x2=690-214=476 hoặc bạn nhóm 2 ra ngoài
425x3-17x3=1275-51=1124 hoặc nhóm 3 ra ngoài
108x6-108x2=648-216=432 hoặc nhóm 108 ra
:))))))))))) dễ mà
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a, x = 108 : ( 2 + 3 + 4 )
x = 108 : 9
x = 12
b, x = 104 : (23 - 8 -7 )
x = 104 : 8
x = 13
a)bằng:2x+3x+4x=9x
108:9=12
b)bằng:23x-8x-7x=8x
104:8=13
nhơ cho mình một coin
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dễ thấy
2014 x 3 - 2014 x 2 - 2014
=2014 x (3-2-1) = 2014 x 0 =0
do đó (1+2+3+.....+109) x (2014 x 3 - 2014 x 2 - 2014)=(1+2+3+...+109) x 0 = 0
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1, (30 x 5 - 24 x 4) x 32 : (30 + 20)
= 54 x 32 : 50
= 1728 : 50
= 34,56
2, (12 x 6 + 108) x 15 + 135 : 45
= 180 x 15 + 135 : 45
= 2700 + 135 : 45
= 2700 + 3
= 2703
3, 807 + 49 x (311 - 4807 : 23)
= 807 + 49 x 102
= 807 + 4998
= 5805
4 , ( 4,72 + 3,57 x 4,1 + 8,5 x 2,434) x 100
= 40,046 x 100
= 4004,6
5, (23,79 : 7,8 - 6,8 : 417) x 3,04 - 2,04
= 2,65 x 3,04 - 2,04
= 8,056 - 2,04
= 6,016
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=(1+2+3+4+5+6+7+.....+108+109)x(2014x(3-2-1))
=(1+2+3+4+5+6+7+.....+108+109)x(2014x0)
=Ax0
=0
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a) 720 : ( x . 2 + x . 3 ) = 3.2
720 : ( x . 2 + x.3 ) = 6
( x .2 + x.3 ) = 720 : 6
x.2+x.3 = 120
x . ( 2 + 3 ) = 120
x . 5 = 120
x = 120 : 5
x = 24
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500x6+500x4-108:12:9
=500x(6+4)-9:9
=500x10-1
=5000-1
=4999
9782x35-9782x25+1000:5:2
=9782x(35-25)+200:2
=9782x10+100
=97820+100
=97920
37800:25:4+57+467x43
=1512:4+57+20081
=378+57+20081
=435+20081
=20516
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\(108\times5+108\times96-108=108\times\left(5+96-1\right)\)
\(=108\times100=10800\)
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