Question

[Mộc Hương]

Tính nhanh:

a)11/7 x 8/13 + 8/13 x 3/7 + 8/13

b)5/7 x 8/13 + 8/13 x 9/7 - 8/13

c)156 x 199 - 57 x 199 - 199

Answer 1

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a.11/7.8/13+8/13.3/7+8/13

=8/13.(11/7+3/7+1)

=8/13.3

=24/13

b.5/7.8/13+8/13.9/7-8/13

=8/13.(5/7+9/7-1)

=8/13.1

=8/13

c.157.199-56.199-199

=199.(157-56-1)

=199.100

19900