Question

1.找出其中错误.In order to improve your English,you can try writin

Answer 1

In order to improve your English,you can try to write an English diary every day.

设7个未知数,具体是哪几个你自己对号入座吧.

a+b+c+x+y+z+t=25

b+z=2(c+z)

a=x+y+t+1

a=b+c

化解可得z=b-2c 4b+c=26

b c 为整数z大于等于0.

b最大为6此时c=2,z=2符合.

当b减小的时候z就小于0了不可.

当b增大的时候c就小于0了也不可.

总上可得b=6

即6位学生只解出乙题