6..25✘10.1=6.25x(10+0.1)=6.25x10+6.25x0.1=62.5+0.625=63.125。
6..25x10.1=6.25x(10+0.1)=6.25x10+6.25x0.1=62.5+0.625=63.125
125+125X79=125X(1+79)=125X80=100009000÷125÷8=9000÷(125X8)=9000÷1000=9