看谁算得巧.①75.5-8.25-12.75②920÷[32×(0.5+45)]③43-43×0.9④815÷16-715×6.-数学

题文

看谁算得巧.
①75.5-8.25-12.75
9
20
÷[
3
2
×(0.5+
4
5
)]
③43-43×0.9
8
15
÷
1
6
-
7
15
×6.
题型:解答题  难度:中档

答案

①75.5-8.25-12.75
=75.5-(8.25+12.75),
=75.5-21,
=54.5;

9
20
÷[
3
2
×(0.5+
4
5
)]
=
9
20
÷[
3
2
×(0.5+0.8)],
=
9
20
÷[
3
2
×
13
10
],
=
9
20
÷
3
2
÷
13
10

=
9
20
×
2
3
×
10
13

=
3
13


③43-43×0.9,
=(1-0.9)×43,
=0.1×43,
=4.3;

8
15
÷
1
6
-
7
15
×6
=
8
15
×6-
7
15
×6,
=(
8
15
-
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