(-5)x(-3 6/7)+(-7)x(-3 6/7)+12x(-3 6/7)

问题描述:

(-5)x(-3 6/7)+(-7)x(-3 6/7)+12x(-3 6/7)
要过程啊

=(-5-7+12)x(-36/7)
=0对不起,那些都是三又七分之六那就改成3又6/7