用简便方法计算下面各题:713-(387+313) 866-370-130 399-195 400-199 807-40

1个回答

  • (1)713-(387+313)

    =713-387-313

    =713-313-387

    =400-387

    =13

    (2)866-370-130

    =866-(370+130)

    =866-500

    =366

    (3)400-199

    =400-200+1

    =200+1

    =201

    (4)807-401

    =800+7-400-1

    =800+400+7-1

    =1206

    (5)369-(246+69)

    =369-69-246

    =300-246

    =54

    (6)594-300=294

    (7)125×897×8

    =125×8×897

    =1000×897

    =897000

    (8)108×75

    =(100+8)×75

    =100×75+8×75

    =7500+600

    =8100

    (9)7×75-7×25

    =7×(75-25)

    =7×50

    =350

    (10)88×27+27×12

    =(88+12)×27

    =100×27

    =2700

    (11)25×36

    =25×4×9

    =100×9

    =900

    (12)103×27

    =(100+3)×27

    =100×27+3×27

    =2700+91

    =2791

    (13)3600÷25÷4

    =3600÷(25×4)

    =3600÷100

    =36

    (14)99×35

    =(100-1)×35

    =100×35-35

    =3500-35

    =3465

    (15)56×27+27×44

    =(56+44)×27

    =100×27

    =2700

    (16)56×99+56

    =(99+1)×56

    =100×56

    =5600

    (17)125×64

    =125×8×8

    =1000×8

    =8000

    (18)9000÷125÷8

    =9000÷(125×8)

    =9000÷1000

    =9