Question

问几个关于去括号的数学题。谢谢了，要过程

化简下列各式：
1. 14(abc-2a)+3(6a-2abc) 2. 3(xy-2z)+(-xy+3z) 3. -4(pq+pr)+(4pq+pr)

Answer 1

1. 14(abc-2a)+3(6a-2abc)
=14abc-28a+18a-6abc
=8abc-10a

2. 3(xy-2z)+(-xy+3z)
=3xy-6z-xy+3z
=2xy-3z

3. -4(pq+pr)+(4pq+pr)
=-4pq-4pr+4pq+pr
=-3pr

Answer 2

1. 14(abc-2a)+3(6a-2abc)=14abc-28a+18a-6abc=8abc-10a
2. 3(xy-2z)+(-xy+3z) =3xy-6z-xy+3z=2xy-3z
3. -4(pq+pr)+(4pq+pr)=-4pq-4pr+4pq+pr=-3pr

Answer 3

1
=14abc-28a+18a-6abc
=8abc-10a
2
=3xy-6z-xy+3z
=2xy-3z
3
=-4pq-4pr+4pq+pr
=-3pr
采纳我吧~~~~采纳我吧~~~~采纳我吧~~~~

Answer 4

1. 14(abc-2a)+3(6a-2abc)
=14abc-28a+18a-6abc
=8abc-10a

2. 3(xy-2z)+(-xy+3z)
=3xy-6z-xy+3z
=2xy-3z

3. -4(pq+pr)+(4pq+pr)
=-4pq-4pr+4pq+pr
=-3pr

Answer 5

解：14(abc-2a)+3(6a-2abc)
=14abc-28a+18a-6abc
=8abc-10a

解：3(xy-2z)+(-xy+3z)
=3xy-6z-xy+3z
=2xy-3z

解：-4(pq+pr)+(4pq+pr)
=-4pq-4pr+4pq+pr
=-3pr