问题 解答题
直接写出得数.
550+325=

1-0.45=

3÷7=
17×40=
910÷70=5-1.4-1.6=60.3×9.8≈39.2÷1.99≈
3
5
-
1
2
=
3-
1
5
=
2
3
×
1
4
=
1.9×4×0.5=
答案

550+325=875,

1-0.45=0.55,

3÷7=

3
7
17×40=680,
910÷70=13,5-1.4-1.6=2,60.3×9.8≈600,39.2÷1.99≈20,
3
5
-
1
2
=
1
10
3-
1
5
=2
2
5
2
3
×
1
4
=
1
6
1.9×4×0.5=3.8.
故答案为:875,0.55,
3
7
,680,13,2,600,20,
1
10
,2
2
5
1
6
,3.8.

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