问题 解答题

选择适合你的方法计算,并写出计算过程.

(1)(125+19)×8

(2)666-(309+266)

(3)75×2×7×4

(4)125×(800-8)

(5)24×24+76×24

(6)5000-666÷37×34

(7)29×75+72×75-75

(8)7800÷[300+5×(66+134)].

答案

(1)(125+19)×8,

=125×8+19×8,

=1000+152,

=1152;

(2)666-(309+266),

=666-266-309,

=400-309,

=91;

(3)75×2×7×4,

=(75×4)×(2×7),

=300×14,

=4200;

(4)125×(800-8),

=125×800-125×8,

=100000-1000,

=99000;

(5)24×24+76×24,

=(24+76)×24,

=100×24,

=2400;

(6)5000-666÷37×34,

=5000-18×34,

=5000-612,

=4388;

(7)29×75+72×75-75,

=(29+72-1)×75,

=100×75,

=7500;

(8)7800÷[300+5×(66+134)],

=7800÷[300+5×200],

=78000÷1300,

=60.

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