问题 解答题

用递等式计算,能简便计算的要简算.

(1)2.01×1.53÷0.18

(2)5.86×99.4+5.86×0.6

(3)2.2×2.2+2.2×7.8

(4)0.25×(4.83-0.85)

(5)(12.5+1.25+0.125)×8

(6)(148.4-90.85)÷2.5.

答案

(1)2.01×1.53÷0.18,

=3.0753÷0.18,

=17.085;

(2)5.86×99.4+5.86×0.6,

=5.86×(99.4+0.6),

=5.86×100,

=586;

(3)2.2×2.2+2.2×7.8,

=2.2×(2.2+7.8),

=2.2×10,

=22;

(4)0.25×(4.83-0.85),

=0.25×3.98,

=0.25×4-0.25×0.02,

=1-0.005,

=0.995;

(5)(12.5+1.25+0.125)×8,

=12.5×8+1.25×8+0.125×8,

=100+10+1,

=110+1,

=111;

(6)(148.4-90.85)÷2.5,

=57.55÷2.5,

=23.02.

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