0.7777×0.7 0.1111x7x0.3
= 0.7777x(0.7 0.3)=0.7777
0.7777*0.7=0.1111*4.9
算式等于0.1111*(4.9+2.1)=0.1111*7=0.7777
(78.6-0.786乘25+0.75乘21.4)除以15乘2001
=(0.786*(100-25)+0.75*21.4)/15*2001
=(78.6*0.75+0.75*21.4)/15*2001
=100*0.75/15*2001
=5*2001
=10005
0.7777*0.7+0.1111*2.1
=0.1111*0.7*(7+3)
=0.1111*0.7*10
=0.1111*7
=0.7777