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420÷6-137200÷9÷4300+300×7(48+52)÷5420÷3×420×6÷2.

题目详情
420÷6-13 7200÷9÷4 300+300×7 (48+52)÷5 420÷3×4 20×6÷2.
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答案和解析
(1)420÷6-13,
=70-13,
=57;

(2)7200÷9÷4,
=7200÷(9×4),
=7200÷36,
=200;

(3)300+300×7,
=300×(1+7),
=300×8,
=2400;

(4)(48+52)÷5,
=100÷5,
=20;

(5)420÷3×4,
=140×4,
=560;

(6)20×6÷2,
=120÷2,
=60;