c) (27-514) - (486-73) +x =7
x = (-487) - 413 + x =7
x = (-900) + x = 7
x= 7 -(-900)
x= 907
d) 2575 + 37 - 2576 - 29 - x = 37
x= 2612 - 2576 -29 -x = 37
x= 36 - 29 - x = 37
x= 7 - x = 37
x= 7 - 37
x= -30
[27+(-514)]-[486+(-73)+ x =7
-(514-27 )-[+(486-73)+x =7
-487-413=x=7
(-487)+(413)+x=7
-(487+413)+x=7
-900+x=7
x=7+(-900)
x=-(900-7)
x=893
vậy x=-893
d) 2575+37-2576-29-x=37
(2575+37)-(2576-29)-x=37
2612-[2576+(-29)]-x=37
2612-2538-x=37
[2612+(-2538)]-x=37
74-x=37
x=74-37
x=74+( -37 )
x=+(74-37)
x=37
vậy x=37
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câu d) hơi tắt 1 chút
c)( 27-514) - (486-73) + x = 7
-487 - 413 + x = 7
(-900) + x = 7
x = 7 - (-900)
x = 907