Question

3.7x0.15 +4.02,4.8—4.8x0.5 这两道题怎么简便计算?

Answer 1

3.7x0.15 +4.02=(4-0.3)*0.15+4.02=4*0.15-0.3*0.15+4.02=0.60-0.045+4.02=4.575

4.8—4.8x0.5=4.8(1-0.5)=4.8*0.5=2.4