问题 解答题

用递等式计算,能简算的就简算.

(1)(0.1-0.09)×100

(2)3.12÷0.025×1.5

(3)1.2×2.5×4×0.2×5

(4)0.25×0.125×32

(5)1.25+1.25+1.25×8

(6)70.6-35×1.7+13.5÷5.

答案

(1)(0.1-0.09)×100,

=0.1×100-0.09×100,

=10-9,

=1;

(2)3.12÷0.025×1.5,

=124.8×1.5,

=187.2;

(3)1.2×2.5×4×0.2×5,

=1.2×(2.5×4)×(0.2×5),

=1.2×10×1,

=12;

(4)0.25×0.125×32,

=0.25×0.125×(4×8),

=(0.25×4)×(0.125×8),

=1×1,

=1;

(5)1.25+1.25+1.25×8,

=1.25×(1+1+8),

=1.25×10,

=12.5;

(6)70.6-35×1.7+13.5÷5,

=70.6-59.5+2.7,

=11.1+2.7,

=13.8.

填空题