Question

77.5*0.48+4.8*2.25 6分之5*0.25+4分之1*6分之1 两题都用简便方法

Answer 1

77.5*0.48+4.8*2.25

=77.5×0.48+0.48×22.5

=0.48×（77.5+22.5）

=0.48×100

=48

6分之5*0.25+4分之1*6分之1

=(5/6)×0.25+0.25×(1/6)

=0.25×[(1/6)+(5/6)]

=0.25×1

=0.25