问题 解答题
62.8×19-8×62-623.64×[1÷(2-2.09)]
1.9-1.9×(1.9-1.9)(1-1%×70)÷0.32O
答案

(1)62.8×19-8×62-62

=1193.2-496-62,

=635.2;

(2)3.64×[1÷(2-2.09)]

=3.64×[1÷(-0.09)],

=

91
25
×(-
100
9
),

=-

364
9

(3)1.9-1.9×(1.9-1.9)

=1.9-1.9×0,

=1.9-0,

=1.9;

(3)(1-1%×70)÷0.32O

=(1-0.7)÷

8
25

=

3
10
×
25
8

=

15
16

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