问题 解答题

怎样简便就怎么样算.

4.8+2.71+5.2+5.29

35×69+65×69

4×27×25

31.29-3.87-6.13.

答案

(1)4.8+2.71+5.2+5.29,

=(4.8+5.2)+(5.29+2.71),

=10+8,

=18;

(2)35×69+65×69,

=(35+65)×69,

=100×69,

=6900;

(3)4×27×25,

=4×25×27,

=100×27,

=2700;

(4)31.29-3.87-6.13,

=31.29-(3.87+6.13),

=31.29-10,

=21.29.

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