7x+8(x-2)[x是未知数]如何化简?如:15x+4x=19x[x是未知数]
问题描述:
7x+8(x-2)[x是未知数]如何化简?
如:15x+4x=19x[x是未知数]
答
7x+8(x-2)
=7x+8x-16
=15x-16
答
7x+8(x-2)
=7x+8x-2*8
=7x+8x-16
=15x-16