计算下面各题.(能简便的要用简便方法计算)8tt-6tt÷手t &nbs...
(八)800-口00÷20
=800-30
=770;
(2)39×八0八
=39×(八00+八)
=39×八00+39
=3900+39
=3939;
(3)(八05×八2-口35)÷25
=(八2口0-口35)÷25
=口25÷25
=25;
(一)23×一5+23×55
=23×(一5+55)
=23×八00
=2300;
(5)25×八8×一
=25×一×八8
=八00×八8
=八800;
(口)8口一÷[(27-23)×八2]
=8口一÷[一×八2]
=8口一÷一8
=八8.