计算下面各题350÷7+24×3 618-80÷2×5 243+65+(57+135) 15×(41-17)÷30 65×13+13×55 25×(9×4)×3 45÷[210÷(35×2)].
(1)350÷7+24×3
=50+72
=122;
(2)618-80÷2×5
=618-40×5
=618-200
=418;
(3)243+65+(57+135)
=(243+57)+(65+135)
=300+200
=500;
(4)15×(41-17)÷30
=15×24÷30
=360÷30
=12;
(5)65×13+13×55
=13×(65+55)
=13×120
=1560;
(6)25×(9×4)×3
=(25×4)×(9×3)
=100×27
=2700;
(7)45÷[210÷(35×2)]
=45÷[210÷70]
=45÷3
=15.
=50+72
=122;
(2)618-80÷2×5
=618-40×5
=618-200
=418;
(3)243+65+(57+135)
=(243+57)+(65+135)
=300+200
=500;
(4)15×(41-17)÷30
=15×24÷30
=360÷30
=12;
(5)65×13+13×55
=13×(65+55)
=13×120
=1560;
(6)25×(9×4)×3
=(25×4)×(9×3)
=100×27
=2700;
(7)45÷[210÷(35×2)]
=45÷[210÷70]
=45÷3
=15.
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