已知a=负二分之一,b=负7,c=负1又4分之3
1.ab÷(-c)
=(-1/2)*(-7)÷(-(-7/4))
=(7/2)÷(7/4)
=(7/2)*4/7
=2
2.a分之﹣b﹣c
=-(-7)/(-1/2) -(-7/4)
=-14+7/4
=-49/4
已知a=负二分之一,b=负7,c=负1又4分之3
1.ab÷(-c)
=(-1/2)*(-7)÷(-(-7/4))
=(7/2)÷(7/4)
=(7/2)*4/7
=2
2.a分之﹣b﹣c
=-(-7)/(-1/2) -(-7/4)
=-14+7/4
=-49/4