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人教版四年级数学寒假作业答案2015

一、计算题(能简便的要简便)

(280+320)÷[(40-30)×2]

=600÷[10×2]

=600÷20

=30

(7×8715+3×8715)÷15

=(7+3)×8715÷15

=10×8715÷15

=87150÷15

=5810

4500÷25÷4

=4500÷(25×4)

=4500÷100

=45

35×38+35×62+65×39+35×39

=35×(38+62)+39×(65+35)

=35×100+39×100

=100×(35+39)

=100×74

=7400

320×25÷16

=320÷16×25

=20×25

=500

125×88

=125×8×11

=1000×11

=11000

102×208-102×108

=102×(208-108)

=102×100

=10200

101×399-399

=399×(101-1)

=399×100

=39900

125×56

=125×8×7

=1000×7

=7000

36×208-8×36

=36×(208-8)

=36×200

=7200

548-(148+285)

=548-148-285

=400-285

=115

360×48÷9÷8

=360÷9×(48÷8)

=40×6

=240