(1)245-65-35
=245-(65+35)
=245-100
=145
(2)25×(4×27)
=25×4×27
=100×27
=2700
(3)24×56+44×24
=24×(56+44)
=24×100
=2400
(4)8×(25+20)
=8×25+8×20
=200+160
=360
(5)700÷4÷25
=700÷(4×25)
=700÷100
=7
(6)1.29+3.7+0.71+6.3
=(1.29+0.71)+(3.7+6.3)
=2+10
=12
(7)428×78+572×78
=(428+572)×78
=1000×78
=78000
(8)125×89×8
=125×8×89
=1000×89
=89000
(9)415-176-24
=415-(176+24)
=415-200
=215