问题 解答题
下面各题,怎样简便就怎样算.
①0.276×2.5+2.5×2.724②1.25×32×0.25③17.47-7.57-2.43④3.21+9.46+6.79.
答案

①0.276×2.5+2.5×2.724,

=2.5×(0.276+2.724),

=2.5×3,

=7.5;

②1.25×32×0.25,

=1.25×8×4×0.25,

=(25×8)×(4×0.25),

=200×1,

=200;

③17.47-7.57-2.43,

=17.47-(7.57+2.43),

=17.47-10,

=7.47;

④3.21+9.46+6.79,

=(3.21+6.79)+9.46,

=10++9.46,

=19.46.

单项选择题 A1型题
单项选择题