脱式计算(③④⑤小题用简便方法).
1个回答

①635+9030÷86×13,

=635+105×13,

=635+1365,

=2000;

②4.1-2.56÷(0.18+0.62),

=4.1-2.56÷0.8,

=4.1-3.2,

=0.9;

③45×101,

=45×(100+1),

=4500+45,

=4545;

④5.7-(1.9-1.3),

=5.7-1.9+1.3,

=5.7+1.3-1.9,

=7-1.9,

=5.1;

98

99 +

98

99 ×98,

=

98

99 ×(1+98),

=

98

99 ×99,

=98;

4

5 ÷〔

5

8 ×(

1

6 +

1

3 )〕,

=

4

5 ÷[

5

8 ×(

1

6 +

2

6 )],

=

4

5 ÷[

5

8 ×

1

2 ],

=

4

5 ÷

5

16 ,

=

4

5 ×

16

5 ,

=

64

25 ,

=2

14

25 .