计算,能简便计算的要简便计算.38×[89÷(16+34)]25×32×125 &n...

2024-11-25 08:52:43
推荐回答(1个)
回答1:

(1)

3
8
×[
8
9
÷(
1
6
+
3
4
)]
=
3
8
×[
8
9
÷
11
12
]
=
3
8
×
32
33

=
4
11


(2)25×32×125
=25×(4×8)×125
=(25×4)×(8×125)
=100×1000
=100000;

(3)1.8×7.9+79×0.82
=1.8×7.9+7.9×8.2
=(1.8+8.2)×7.9
=10×7.9
=79.