脱式计算(能简算的要简算):62.8×19-8×6245-62453.64×[1÷(2110-2.09)]1800-1350÷18×6(2512+15

2024-11-08 18:50:00
推荐回答(1个)
回答(1):

(枯唤1)62.8×19-8×62

4
5
-62
4
5

=62.8×(19-8-1),
=62.8×10,
=628;
(2)3.64×[1÷(2
1
10
-2.09)],
=3.64×[1÷0.01],
=3.64×100,
=364;
(3)1800-1350÷18×6,
=1800-75×6,
=1800-450,
=1350;
(4)(2
5
12
+ 1
5
8
 +2
7
12
+3.375)族败雹×
3
20

=(5+5)×
3
20

=
3
2

(5)1.9-1.9×(1.9-1.9),
=1.9-0,
=1.9;
(6)兆帆(1-1%×70)÷
2
7

=(1-
7
10
)×
7
2

=
21
20