问题 解答题

计算,能用简算的要简算.

0.85×101                

5.29÷2.3-0.1×01

0.28÷35              

8-4.68÷4.5×(0.25+0.5)

2.5×1.25×32              

25.7×3.29+6.71×25.7.

答案

(1)0.85×101,

=0.85×(100+1),

=0.85×100+0.85×1,

=85+0.85,

=85.85;

(2)5.29÷2.3-0.1×01,

=2.3-0.01,

=2.29;

(3)0.28÷35,

=0.28÷7÷5,

=0.04÷5,

=0.008;              

(4)8-4.68÷4.5×(0.25+0.5).

=8-4.68÷4.5×0.75,

=8-1.04×0.75,

=8-0.78,

=7.22;

(5)2.5×1.25×32,

=(2.5×4)×(1.25×8),

=10×10,

=100;

(6)25.7×3.29+6.71×25.7,

=25.7×(3.29+6.71),

=25.7×10,

=257.

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