Question

2道简便计算3.5×1.75+1.25×2.7+3.8÷0.85分之4+9又5分之4+99又5分之4+999又5分之4+

Answer 1

3.5×1.75+1.25×2.7+3.8÷0.8

=3.5*3.5/2+1.25*2.7+3.8*1.25

=12.25/2+1.25*(2.7+3.8)

=6.125+1.25*6.5

=6.125+1.25*0.8*8.125

=6.125+8.125

=14.25

5分之4+9又5分之4+99又5分之4+999又5分之4+9999又5分之4

=(9+99+999+9999)+4/5*5

=(10+100+1000+10000)-4+4

=11110