问题 解答题
用递等式计算,能用简便方法的用简便方法计算.
45-20×3÷426+14×(70-30)125×(8×4)203×24
108-(83+360÷60)153×8-8×53180÷[36÷(12+6)]75×99+75.
答案

(1)45-20×3÷4,

=45-60÷4,

=45-15,

=30;

(2)26+14×(70-30),

=26+24×40,

=26+960,

=986;

(3)125×(8×4),

=125×8×4,

=1000×4,

=4000;

(4)203×24,

=(200+3)×24,

=200×24+3×24,

=4800+72,

=4872;

(5)108-(83+360÷60),

=108-(83+6),

=108-89,

=19;

(6)153×8-8×53,

=(153-53)×8,

=100×8,

=800;

(7)180÷[36÷(12+6)],

=180÷[36÷18],

=180÷2,

=90;

(8)75×99+75,

=75×(99+1),

=75×100,

=7500.

单项选择题
单项选择题