58×(100-2)=58×100 - 58×2=5800-116=5684
58x(100-2)=58x100-58x2=5800-116=5800-110-6=5790-6=5784
=58×100-58×2=5800-(60-2)×2=5800-60×2+2×2=5800-120+4=5800-100-20+4=5680+4=5684