3
5
÷
2
5
=
5
7
×35=
1.8×
1
6
=
2
3
+
1
4
=
10÷10%= 6.3×20= 7-
5
7
-
2
7
=
4
5
÷80%=
4
5
+
1
5
÷
1
5
=
4
9
×
3
4
÷
4
9
=
分析:除以一個數(shù),就等于乘這個數(shù)的倒數(shù);分數(shù)乘分數(shù),用分母乘分母,分子乘分子;分數(shù)乘整數(shù)(小數(shù)),先約分再計算;異分母分數(shù)相加減,先化成同分母分數(shù),再進行加減即可解答,據(jù)此分析即可逐題解答.
解答:解:(1)
3
5
÷
2
5

=
3
5
×
5
2

=
3
2
;

(2)
5
7
×35
=25;

(3)1.8×
1
6
=0.3;

(4)
2
3
+
1
4
=
11
12
;

(5)10÷10%
=10×
100
10

=100;

(6)6.3×20=126;

(7)7-
5
7
-
2
7

=7-(
5
7
+
2
7

=7-1
=6;

(8)
4
5
÷80%
=
4
5
×
100
80

=1;

(9)
4
5
+
1
5
÷
1
5

=
4
5
+1
=1
4
5
;

(10)
4
9
×
3
4
÷
4
9

=
1
3
÷
4
9

=
1
3
×
9
4

=
3
4
點評:此題主要考查分數(shù)四則運算的計算法則的靈活應用,要注意能簡便計算的要簡便計算.
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