(1) 4.08x0.25
=4x0.25+0.08x0.25
=1+0.02
=1.02
(2) 490x0.35
=500x0.35-10x0.35
=175-3.5
=171.5
1.分成4+0.08再乘以四分之一就是1+0.02=1.02
2.0.35分成0.25+0.1乘出来就是122.5+49=191.5
(1)4.08X0.25=4.08÷4=1.08
(2)490X0.35=4.9X35=(5-0.1)X35=5x35-0.1X35=175-3.5=171.5
4.08*0.25=4*0.25+0.08*0.25=1+0.02=1.02
4.08×0.25
=4×0.25+0.08×0.25
=1+0.02
=1.02
490×0.35
=500×0.35-10×0.35
=175-3.5
=171.5