问题 解答题
用递等式计算,能简算的要简算.
135÷27+12×4
1620-1320÷60+80
(85+14×5)÷5520÷[13×(43-33)]
490÷[210÷(360÷12)][160-(75+38)]×107
45+61+39+5525×5×4×2
125×(8×5)×7.
答案

(1)135÷27+12×4,

=5+48,

=53;

(2)1620-1320÷60+80,

=1620-22+80,

=1598+80,

=1678;

(3)(85+14×5)÷5,

=(85+70)÷5,

=155÷5,

=31;

(4)520÷[13×(43-33)],

=520÷[13×10],

=520÷130,

=4;

(5)490÷[210÷(360÷12)],

=490÷[210÷30],

=490÷7,

=70;

(6)[160-(75+38)]×107,

=[160-113]×107,

=47×107,

=5029;

(7)45+61+39+55,

=(45+55)+(61+39),

=100+100,

=200;

(8)25×5×4×2,

=(25×4)×(5×2),

=100×10,

=1000;

(9)125×(8×5)×7,

=(125×8)×(5×7),

=1000×35,

=35000.

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