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774÷258×42562+107-262+3939160-160×12821+21×40-2848×(102+203÷7)379+[(620-548)×25].

题目详情
774÷258×42
562+107-262+393
9160-160×12
821+21×40-28
48×(102+203÷7)
379+[(620-548)×25].
▼优质解答
答案和解析
(1)774÷258×42,
=3×42,
=126;

(2)562+107-262+393,
=(562-262)+(107+393),
=300+500,
=800;

(3)9160-160×12,
=9160-1920,
=7240;

(4)821+21×40-28,
=821+840-28,
=1661-28,
=1633;

(5)48×(102+203÷7),
=48×(102+29),
=48×131,
=6288;

(6)379+[(620-548)×25],
=379+[72×25],
=379+1800,
=2179.