Question

Tính nhanh:
a,15*3939-39*1515
b,36*333-108*111
c,65*111-13*15*37
d,59*1717-5959*17

Answer 1

* là dấu nhân à

Answer 2

a: \(=15\cdot39\cdot\left(101-101\right)=0\)

b: \(=36\cdot3\cdot111-108\cdot111=0\)

c: \(=65\cdot111-65\cdot111=0\)

d: \(=59\cdot17\left(101-101\right)=0\)

Answer 3

a,15x3939-39x1515

=15x3939-39x101x15

=15x3939-3939x15

=0

b,36x333-108x111

=36x333-36x3x111

=36x333-36x333

=0

c,65x111-13x15x37

=65x111-13x5x3x37

=65x111-65x111

=0

59x1717-5959x17

=59x1717-59x101x17

=59x1717-59x1717

=0