问题 解答题
29.46-(9.46+3.8)15.75+0.65-2.75+3.35102×3585+85×99
65.71-4.99125×48360÷45(125-30)×8.
答案

(1)29.46-(9.46+3.8),

=29.46-9.46-3.8,

=20-3.8,

=16.2;

(2)15.75+0.65-2.75+3.35,

=(15.75-2.75)+(0.65+3.35),

=13+4,

=17;

(3)102×35,

=(100+2)×35,

=100×35+2×35,

=3500+70,

=3570;

(4)85+85×99,

=85×(1+99),

=85×100,

=8500;

(5)65.71-4.99,

=65.71-(5-0.01),

=65.71-5+0.01,

=60.71+0.01,

=60.72;

(6)125×48,

=125×8×6,

=1000×6,

=6000;

(7)360÷45,

=(360÷9)÷(45÷9),

=40÷5,

=8;

(8)(125-30)×8,

=125×8-30×8,

=1000-240,

=760.

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