直接寫出得數(shù).
3
5
+
1
5
=
1-
3
5
=
7
9
-
2
9
=
0.9×100=
2
3
+
1
4
=
0.64÷16= 10-9.12= 0.7÷3.5=
0.8×125=
7
8
+
1
8
=
分析:本題根據(jù)分?jǐn)?shù)及小數(shù)的加法、減法、乘法、除法的運算法則計算即可.
解答:解:
3
5
+
1
5
=
4
5
1-
3
5
=
2
5
7
9
-
2
9
=
5
9
0.9×100=90
2
3
+
1
4
=
11
12
0.64÷16=0.04 10-9.12=0.88 0.7÷3.5=0.2
0.8×125=100
7
8
+
1
8
=1
故答案為:
4
5
,
2
5
,
5
9
,90,
11
12
,0.04,0.88,0.2,100,1.
點評:完成此類題目不能只追求運算速度,更要注意答案的正確性.
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