问题 解答题

脱式计算,能简算的要简算.

893+(594+107)

105+298

5×(17×24)

125×16

720÷16÷5

1000-293-707.

答案

(1)893+(594+107)

=(893+107)+594

=1000+594

=1594

(2)105+298

=(100+5)+(300-2)

=(100+200)+(5-2)

=400+3

=403

(3)5×(17×24)

=(5×24)×17

=120×17

=(100+20)×17

=100×17+20×17

=1700+340

=2040

(4)125×16

=(125×8)×2

=1000×2

=2000

(5)720÷16÷5

=720÷(16×5)

=720÷80

=9

(6)1000-293-707

=1000-(293+707)

=1000-1000

=0

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