题目内容

直接写数对又快!
5
9
×
1
5
÷
5
9
×
1
5
=
1
8
÷
1
8
÷
1
8
=
1
11
×12.1-1=
3
5
+
2
5
÷
1
5
=
1÷0.1-1×0.1=15.4-(5.4-4.5)=0.4×0.4=402-139=
(1)
5
9
×
1
5
÷
5
9
×
1
5

=
5
9
×
1
5
×
9
5
×
1
5

=
1
25


(2)
1
8
÷
1
8
÷
1
8

=
1
8
×8×8,
=8;

(3)
1
11
×12.1-1,
=1.1-1,
=0.1;

(4)
3
5
+
2
5
÷
1
5

=
3
5
+
2
5
×5,
=
3
5
+2,
=2
3
5


(5)1÷0.1-1×0.1,
=10-0.1,
=9.9;

(6)15.4-(5.4-4.5),
=15.4-5.4+4.5,
=10+4.5,
=14.5;

(7)0.4×0.4=0.16;

(8)402-139,
=(400+2)-(100+39),
=400-100-(39-2),
=300-37,
=263.
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