脱式计算（能简算的要简算）710÷9+310×19；8.2-6.25+9.8-0.75；15÷625-23×732；4.86×[1÷（2.1-2.09）]．

Question

脱式计算（能简算的要简算）
(7)/(10)÷9+(3)/(10)×(1)/(9)；
8.2-6.25+9.8-0.75；
(1)/(5)÷(6)/(25)-(2)/(3)×(7)/(32)；
4.86×[1÷（2.1-2.09）]．

Answer 1

（1）(7)/(10)÷9+(3)/(10)×(1)/(9)
=(7)/(10)×(1)/(9)+(3)/(10)×(1)/(9)
=（(7)/(10)+(3)/(10)）×(1)/(9)
=1×(1)/(9)
=(1)/(9)；

（2）8.2-6.25+9.8-0.75
=8.2+9.8-（6.25+0.75）
=18-7
=11；

（3）5÷(6)/(25)-(2)/(3)×(7)/(32)
=-(2)/(3)×(7)/(32)
=(331)/(16)；

（4）4.86×[1÷（2.1-2.09）]
=4.86×[1÷0.01]
=4.86×100
=486．