递等式计算,能简便计算的一定要简便计算.25×40.1 12.5×3.2 100.98÷9 (0.25+0.25+0.25)×4

2025-03-13 12:15:51
推荐回答(1个)
回答1:

(1)25×40.1
=25×(40+0.1),
=25×40+25×0.1,
=100+2.5,
=102.5;

(2)12.5×3.2
=12.5×0.8×4,
=10×4,
=40;

(3)100.98÷9
=(99+1.98)÷9.
=99÷9+1.98÷9,
=11+0.22,
=11.22;

(4)(0.25+0.25+0.25)×4
=3×(0.25×4),
=3×1,
=3;

(5)5.64÷2.5÷0.4
=5.64÷(2.5×0.4),
=5.64÷1,
=5.64.