问题
解答题
|
答案
(1)62×7.1+2.9,
=440.2+2.9,
=443.1;
(2)4.2×0.25,
=(4+0.2)×0.25,
=4×0.25+0.2×0.25,
=1+0.05,
=1.05;
(3)5.2×4.3+0.8×4.3,
=(5.2+0.8)×4.3,
=6×4.3,
=25.8.
|
(1)62×7.1+2.9,
=440.2+2.9,
=443.1;
(2)4.2×0.25,
=(4+0.2)×0.25,
=4×0.25+0.2×0.25,
=1+0.05,
=1.05;
(3)5.2×4.3+0.8×4.3,
=(5.2+0.8)×4.3,
=6×4.3,
=25.8.