Question

脱式计算；能简便的要简便计算．①0.25×7+0.48×7+0÷7②99+99×99+100③2

脱式计算；能简便的要简便计算．①0.25×7+0.48×7+0÷7②99+99×99+100③27+328+73④8.1÷[（417-0.005×700）÷127]．

Answer 1

①0.25×7+0.48×7+0÷7
=（0.25+0.48）×7
=0.73×7
=5.11

②99+99×99+100
=99×（99+1）+100
=9900+100
=10000

③27+328+73
=（27+73）+328
=100+328
=428

④8.1÷[（4

1

7

-0.005×700）÷1

2

7

]
=8.1÷[（4

1

7

-

7

2

）×

7

9

]
=8.1÷[（

58

14

-

49

14

）×

7

9

]
=8.1÷[

9

14

×

7

9

]
=8.1×2
=16.2