a) -82-(x+18)+100= -82-x-18+100= -100-x+100= x
b) 2.(x-5)-(x-12)=2x-10-x+12= x+2
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a) -82 - (x + 18) + 100
= -82 - x - 18 + 100
= -82 - 18 + 100 - x
= -100 + 100 - x
= 0 - x
= -x
b) 2.(x - 5) - (x - 12)
= 2x - 10 - x + 12
= 2x - x - 10 + 12
= x - 10 + 12
= x + 2
Trả lời:
a, -82 - ( x + 18 ) + 100
= -82 - x - 18 +100
= (-82 - 18 ) + 100 - x
= - 100 + 100 - x
= 0 - x
= -x
b, 2. ( x - 5 ) - ( x - 12 )
= 2x - 10 -x + 12
= (2x - x ) + (-10 + 12 )
= 0 + 2
= 2