12.3+34.5+56.7+78.9分之123+345+567+789等于

问题描述:

12.3+34.5+56.7+78.9分之123+345+567+789等于
1÷(3÷7)÷(7÷11)÷(11÷7)
511×737373分之373737等于

1)
(123+345+567+789)/(12.3+34.5+56.7+78.9)
=10(12.3+34.5+56.7+78.9)/(12.3+34.5+56.7+78.9)
=10
2)
1÷(3÷7)÷(7÷11)÷(11÷7)
=1÷(3/7)÷(7/11)÷(11/7)
=1×7/3×11/7×7/11
=7/3
3)
511×373737/737373
=511×(37×10101)/(73×10101)
=(73×7)×37/73
=7×37
=259