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475+(666+334)-100-=475+1000-1000=475
1245-238+755-572+45=(1245+755+45)-(238+572)=2045-810=1235
(434+191(-(191-434)=434+191-191+434=868
472-186-172+986=(472-172)+(986-186)=300+800=1100
475 + 666 + 334 - 1000
= 475 + ( 666 + 334 ) -1000
= 475 + 1000 + 1000
= 1475 - 1000
= 475
1245 - 238 + 755 - 572 + 45
= 1245 - ( 238 + 572 ) + ( 755 + 45 )
= 1245 - 810 - 800
= 1245 - 10
= 1235
( 434 + 191 ) - ( 191 - 434 )
= ( 434 - 434 ) - ( 191- 191 )
= 0 - 0
= 0
472 - 186 - 172 + 986
= ( 472 - 172 ) + ( 986 - 186 )
= 300 + 800
= 1100
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18/15*35/36+18/15*15/18-18/15*20/72
5/6+1/1-1/3
5/6+6/6-2/6
3/2
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\(1245:x+64:x-35:x+26:x=100\\ \Rightarrow1245\times\dfrac{1}{x}+64\times\dfrac{1}{x}-35\times\dfrac{1}{x}+26\times\dfrac{1}{x}=100\\ \Rightarrow\left(1245+64-35+26\right)\times\dfrac{1}{x}=100\\ \Rightarrow1300\times\dfrac{1}{x}=100\\ \Rightarrow\dfrac{1}{x}=\dfrac{1}{13}\\ \Rightarrow x=13\)
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x:(1245+64-35+26)=100
x:1300=100
x=130000
b,x*(236-36)=2000
x*200=2000
x=2000:200
x=10
**** nha bạn phương Chi
a/
1245:x+64:x-35:x+26:x=100
=>(1245+64-35+26):x=100
=>1300:x=100
=>x=1300:100
=>x=13
236*x-x*36=2000
=>x*(236-36)=2000
=>x*200=2000
=>x=2000:200
=>x=10
![](https://rs.olm.vn/images/avt/0.png?1311)
=415628
bằng 415628 nha bạn !