Question

86×78+86+86×21简便运算？

Answer 1

86×78+86+86×21
=86x(78+1+21)
=86x100
=8600

Answer 2

86×78+86+86×21
= 86 x (78 +1 +21)
=86 x 100
=8600

Answer 3

86*100（78+21+1）

Answer 4

=86×(78+1+21)
=86×100
=8600