递等式计算:(能简算的用简便方法计算)
1个回答

(1)(5.81-2.09)×3.5,

=3.72×3.5,

=13.02;

(2)2.5×8×0.5+40,

=2.5×4×2×0.5+40,

=(2.5×4)×(2×0.5)+40,

=10×1+40,

=10+40,

=50;

(3)3.865+1.92+3.135+2.08,

=(3.865+3.135)+(1.92+2.08),

=7+4,

=11;

(4)5.8×6.1+3.2×6.1+6.1,

=(5.8+3.2+1)×6.1,

=10×6.1,

=61;

(5)16÷0.25÷0.4,

=16÷(0.25×0.4),

=16÷0.1,

=160;

(6)(750-366)÷48×[25÷(210-209)],

=384÷48×[25÷(210-209)].

=384÷48×[25÷1],

=384÷48×25,

=8×25,

=200.