65*8+69*2 56*98 39*8+6*39-39*4 怎样简便计算
3个回答
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(1)65*8+69*2
=65*8+(65+4)*2
=65*8+65*2+4*2
=65(8+2)+8
=650+8
=658
(2) 56*98
=56(100-2)
=5600-112
=5488
(3) 39*8+6*39-39*4
=39(8+6-4)
=39×10
390
=65*8+(65+4)*2
=65*8+65*2+4*2
=65(8+2)+8
=650+8
=658
(2) 56*98
=56(100-2)
=5600-112
=5488
(3) 39*8+6*39-39*4
=39(8+6-4)
=39×10
390
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展开全部
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
=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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