9分之2X[(8.5+11.5)除以50%+50]
问题描述:
9分之2X[(8.5+11.5)除以50%+50]
答
=9分之2X(20×2+50)
=9分之2X90
=20
9分之2X[(8.5+11.5)除以50%+50]
=9分之2X(20×2+50)
=9分之2X90
=20