1800÷[(15+10)×3] [510-(150+120)]÷16 15×[107-(35-18)] [175-(29+26)]×23 78+(64×8-32
1800÷[(15+10)×3][510-(150+120)]÷1615×[107-(35-18)][175-(29+26)]×2378+(64×8-320)(272-1...
1800÷[(15+10)×3] [510-(150+120)]÷16 15×[107-(35-18)] [175-(29+26)]×23 78+(64×8-320) (272-186)×(345-245) 14×[(860-260)÷15] 30÷[480÷(24-8)]
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(1)1800÷[(15+10)×3],
=1800÷[25×3],
=1800÷75,
=24;
(2)[510-(150+120)]÷16,
=[510-270]÷16,
=240÷16,
=15;
(3)15×[107-(35-18)],
=15×[107-17],
=15×90,
=1350;
(4)[175-(29+26)]×23,
=[175-55]×23,
=120×23,
=2760;
(5)78+(64×8-320),
=78+(512-320),
=78+192,
=270;
(6)(272-186)×(345-245),
=86×100,
=8600;
(7)14×[(860-260)÷15〕],
=14×[600÷15],
=14×40,
=560;
(8)30÷[480÷(24-8)],
=30÷[480÷16],
=30÷30,
=1.
=1800÷[25×3],
=1800÷75,
=24;
(2)[510-(150+120)]÷16,
=[510-270]÷16,
=240÷16,
=15;
(3)15×[107-(35-18)],
=15×[107-17],
=15×90,
=1350;
(4)[175-(29+26)]×23,
=[175-55]×23,
=120×23,
=2760;
(5)78+(64×8-320),
=78+(512-320),
=78+192,
=270;
(6)(272-186)×(345-245),
=86×100,
=8600;
(7)14×[(860-260)÷15〕],
=14×[600÷15],
=14×40,
=560;
(8)30÷[480÷(24-8)],
=30÷[480÷16],
=30÷30,
=1.
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