问题 解答题

2.47×6.5+7.53×6.5

0.65×101

4.12-1.78-1.22

3.6+6.4×1.5.

答案

(1)2.47×6.5+7.53×6.5,

=(2.47+7.53)×6.5,

=10×6.5,

=65;

(2)0.65×101,

=0.65×(100+1),

=0.65×100+0.65,

=65+0.65,

=65.65;

(3)4.12-1.78-1.22,

=4.12-(1.78+1.22),

=4.12-3,

=1.12;

(4)3.6+6.4×1.5,

=3.6+3.2×(2×1.5),

=3.6+3.2×3,

=3.6+9.6,

=13.2.

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