化简 1a (2h-k)-(5h-9k) 1b 6(a+b)-4(a-b)

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化简 1a (2h-k)-(5h-9k) 1b 6(a+b)-4(a-b)
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化简 1a (2h-k)-(5h-9k) 1b 6(a+b)-4(a-b)
化简 1a (2h-k)-(5h-9k) 1b 6(a+b)-4(a-b)

化简 1a (2h-k)-(5h-9k) 1b 6(a+b)-4(a-b)
1a:
(2h-k) - (5h-9k)
= 2h-k-5h+9k
= -3h+8k
答:-3h+8k
1b:
6(a+b)-4(a-b)
=6a+6b-4a+4b
=2a+10b
答:2a+10b

-3h+8k