题目内容

脱式计算.
12÷25-23×710
85×25+85×85-10×85
32×25×12537.8×19-9×37.8
8.7×1011÷(
3
5
÷
8
5
×
4
15
(1)12÷(25-23)×710,
=12÷2×710,
=6×710,
=4260;

(2)85×25+85×85-10×85,
=85×(25+85-10),
=25×100,
=2500;

(3)32×25×125,
=8×4×25×125,
=(8×125)×(4×25),
=1000×100,
=100000;

(4)37.8×19-9×37.8,
=(19-9)×37.8,
=10×37.8,
=378;

(5)8.7×101,
=8.7×(100+1),
=8.7×100+8.7×1,
=870+8.7,
=878.7;

(6)1÷(
3
5
÷
8
5
×
4
15
),
=1÷(
3
8
×
4
15
),
=1÷
1
10

=10.
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