题目内容

脱式计算(能简算的要简算):
62.8×19-8×62
4
5
-62
4
5
3.64×[1÷(2
1
10
-2.09)]
1800-1350÷18×6(2
5
12
+1
5
8
+2
7
12
+3.375)×
3
20
1.9-1.9×(1.9-1.9)(1-1%×70)÷
2
7
(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)×
3
20

=(5+5)×
3
20

=
3
2

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

=(1-
7
10
)×
7
2

=
21
20
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