Question

七年级下册数学书人教版第三章（去括号）3.6习题1.2题怎么做？谢谢

1题:-8(3a-2ab+4)；4（m+p）-7(n-2q) 2题：化简下列格式：-2n-(3n-1); a-(5a-3b)+（2b-a）;-3(2s-5)+6s; 1-(2a-1)-(3a+3); 3(-ab+2a)-(3a-b); 14(abc-2a)+3(6a-2abc); 3(xy-2z)=+(-xy+3z); -4(pq+pr)+(4pq+pr).

Answer 1

1、(1)-8(3a-2ab+4)=-(24a-16ab+32)=-24a+16ab-32
(2)4（m+p）-7(n-2q)=（4m+4p）-(7n-14q)=4m+4p-7n+14q
2、（1）-2n-(3n-1)= -2n-3n+1 =-5n+1
（2）a-(5a-3b)+（2b-a）=a-5a+3b+2b-a=(a-5a-a)+(3b+2b)=-5+5b
(3)3(2s-5)+6s=6s-15+6s=-15
(4) 1-(2a-1)-(3a+3)=1-2a+1-3a-3=(1+1-3)-(2a+3a)=-1-5a
(5) 3(-ab+2a)-(3a-b)=-3ab+6a-3a+b=-3ab+3a+b
(6)14(abc-2a)+3(6a-2abc)=14abc-28a+18a-6abc=8abc-10a
（7）3xy-6z+（-xy）+3z=2xy-3z
（8）-4(pq+pr)+(4pq+pr)=-4pq-4pr+4pq+pr=-3pr

Answer 2

1题 -8(3a-2ab+4)=-(24a-16ab+32)=-24a+16ab-32

4（m+p）-7(n-2q)=4m+4p-7n+14q

2题 -2n-（3n-1) = -2n-3n+1 =-5n+1

a-(5a-3b)+（2b-a）=a-5a+3b+2b-a=-5a+5b

-3(2s-5)+6s=-6s+15+6s=15

1-(2a-1)-(3a+3)=1-2a+1-3a-3=-5a-1

3(-ab+2a)-(3a-b)=-3ab+6a-3a+b=-3ab+3a+b

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

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

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

表示楼上几位答案都有好几个错的。。。

Answer 3

-24a+16ab-32
4m+4p-7n+14q
-5n+1
-5a+5b
15
-a-1
-6ab+3a-b
8abc+46a
4xy-9z=0
-3pr

Answer 4

1题:-24a+16ab-32
4m+4p-7n+14q

2题：-5n+1
-5a+5b
15
-a-1
-6ab+3a-b
8abc+46a
4xy-9z=0
-3pr

Answer 5

学校的环境如何？