问题
填空题
2.5×1.9×4=______×______×1.9
32×10.1=32×(______+______)=______×______+______×______.
答案
2.5×1.9×4,
=(2.5×4)×1.9,
=10×1.9,
=19;
32×10.1,
=32×(10+0.1),
=32×10+32×0.1,
=320+3.2,
=323.2;
故答案为:2.5,4;10,0.1,32,10,32,0.1.