(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