Question

65*8+69*2 56*98 39*8+6*39-39*4 怎样简便计算

Answer 1

65×8+69×2

=65×8+(65+4)×2

=65×8+65×2+4×2

=65×(8+2)+8

=65×10+8

=650+8

=658

39×8+6×39-39×4

=39×(6+8-4)

=39×10

=390

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