Tìm x thuộc Z
132-(-432+764)-(321-x)+(-432-132+521)=-(-212)-422
2x-{234-[-456+(-543-3x)=23
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phá ngoặc lun nà:
2x-(234-(-456-543-3x))=23
2x-(234+456+543+3x)=23
2x-234-456-543-3x=23
-x-1233=23
-x=23+1233=1256
x=1256
a/\(-\left(-432-3x\right)+\left(-432-4x+21\right)=-2345\)
\(\Leftrightarrow+432+3x-432-4x+21=-2345\)\(\Leftrightarrow\left[432+\left(-432\right)\right]+\left[\left(-4x\right)+3x\right]+21=-2345\)
\(\Leftrightarrow0+-1x+21=-2345\)\(\Leftrightarrow-1x=-2345-21=-2366\)
\(\Rightarrow x=\left(-2366\right):\left(-1\right)=2366\)
b/\(12x-\left(-3546-3x\right)=\left(2x-234\right)-\left(-678-2x\right)\)
\(\Leftrightarrow12x+3546+3x=2x-234+678+2x\)
\(\Leftrightarrow15x+3546=\left(2x+2x\right)+\left[\left(-234\right)+678\right]\)
\(\Leftrightarrow15x+3546=4x+444\)
\(\Leftrightarrow15x+3546-4x-444=0\)
\(\Leftrightarrow\left(15x-4x\right)+\left(3546-444\right)=0\)
\(\Leftrightarrow11x+3102=0\)
\(\Leftrightarrow11x=0-3102=-3102\)
\(\Rightarrow x=\left(-3102\right):11=-282\)
321 + 456 - 234 = 543
543 - 123 + 456 = 876
234 + 234 - 321 = 147
a) a)321+456-234= 543
b)543-123+456=876
c)321+234-321=234
(864 x11 -432 x4 ) :[ 432 x (135-132) ]
=(9504-1728) : ( 432 x 3 )
=7776 : 1296
= 6
( click đúng nha bạn )
`a)25xx532xx4`
`=(25xx4)xx432`
`=432xx100=43200`
`b)456xx200-456xx100`
`=456xx(200-100)`
`=456xx100=45600`
\(a,25\times432\times4=25\times4\times432=100\times432=4320\\ b,456\times200-456\times100=456\times\left(200-100\right)=456\times100=45600\)