问题 解答题
[
4
7
×(
3
5
-0.25)+
3
10
1
2

3.5×0.782÷(2.2-1.97)
(0.25+0.7)÷0.25×250%
1001-9036÷18.
答案

(1)[

4
7
×(
3
5
-0.25)+
3
10
1
2

=[

4
7
×
7
20
+
3
10
1
2

=[

2
10
+
3
10
1
2

=

1
2
÷
1
2

=1;

(2)3.5×0.782÷(2.2-1.97),

=3.5×0.782÷0.23,

=2.737÷0.23,

=11.9;

(3)(0.25+0.7)÷0.25×250%,

=0.95÷0.25×250%,

=3.8×2.5,

=9.5;

(4)1001-9036÷18,

=1001-502,

=499.

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