用递等式计算(能简算的要用简便方法计算).
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①20-
7
18 -
11
18 ,
=20-(
7
18 +
11
18 ),
=20-1,
=19;
②9.07×99+9.07,
=9.07×(99+1),
=9.07×100,
=907;
③
1
6 +
3
4 ×
2
3 ÷2,
=
1
6 +
1
2 ÷2,
=
1
6 +
1
4 ,
=
5
12 ;
④2.3+3.91÷(22-19.7),
=2.3+3.91÷2.3,
=2.3+1.7,
=4;
⑤
8
9 ×[
3
4 -(
7
16 -
1
4 )],
=
8
9 ×[
3
4 -
3
16 ],
=
8
9 ×
9
16 ,
=
1
2 .
7
18 -
11
18 ,
=20-(
7
18 +
11
18 ),
=20-1,
=19;
②9.07×99+9.07,
=9.07×(99+1),
=9.07×100,
=907;
③
1
6 +
3
4 ×
2
3 ÷2,
=
1
6 +
1
2 ÷2,
=
1
6 +
1
4 ,
=
5
12 ;
④2.3+3.91÷(22-19.7),
=2.3+3.91÷2.3,
=2.3+1.7,
=4;
⑤
8
9 ×[
3
4 -(
7
16 -
1
4 )],
=
8
9 ×[
3
4 -
3
16 ],
=
8
9 ×
9
16 ,
=
1
2 .
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