Question

173×64-73×4的简便运算？

Answer 1

173X64一73x4
=1OOX64十73X64一73×4
=640O十73x(64一4)
=64OO十73X6O
=64OO十7OX6O十3×6O
=64OO十42OO十18O
=1O6OO十18O
=1O78O