Rút gọn các biểu thức sau
a) 16+x-(x+y-24)-y
b) (-x+y-z)+(x-y)-(x-y+z)
c) (a+b+c)-(a+b-5)
Rút gọn các biểu thức sau a) 16+x-(x+y-24)-y b) (-x+y-z)+(x-y)-(x-y+z) c) (a+b+c)-(a+b-5)
By Eden
By Eden
Rút gọn các biểu thức sau
a) 16+x-(x+y-24)-y
b) (-x+y-z)+(x-y)-(x-y+z)
c) (a+b+c)-(a+b-5)
`a) 16+x-(x+y-24)-y`
`=16+x-x-y+24-y`
`=(16+24)+(x-x)+(-y-y)`
`=40-2y`
`b) (-x+y-z)+(x-y)-(x-y+z)`
`=-x+y-z+x-y-x+y-z`
`=(-x+x-x)+(y-y+y)+(-z-z)`
`=-x+y-2z`
`c) (a+b+c)-(a+b-5)`
`=a+b+c-a-b+5`
`=(a-a)+(b-b)+c+5`
`=5+c`
a, 16 + x – ( x + y – 24 ) – y
= 16 + x – x – y + 24 – y = 40 – 2y
b, ( -x + y – z ) + ( x – y ) – ( x – y + z )
= -x + y – z + x – y – x + y – z
= -x + y -2z
c, ( a + b + c ) – ( a + b – 5 )
= a + b + c – a – b + 5
= 5 + c