36×72+36×27+36 125×32×25 4.64-(0.64+3.62) 21÷9+22÷9+23÷9+24÷9 199999.9+19999.8+1999.9+199.8+19.9+0.7.

问题描述:

36×72+36×27+36 125×32×25 4.64-(0.64+3.62)
21÷9+22÷9+23÷9+24÷9 199999.9+19999.8+1999.9+199.8+19.9+0.7.

(1)36×72+36×27+36,
=36×(72+27+1),
=36×100,
=3600;
(2)125×32×25,
=(125×8)×(4×25),
=1000×100,
=100000;
(3)4.64-(0.64+3.62),
=4.64-0.64-3.62,
=4-3.62,
=0.38;
(4)21÷9+22÷9+23÷9+24÷9,
=

21
9
+
22
9
+
23
9
+
24
9

=
90
9

=10;
(5)199999.9+19999.8+1999.9+199.8+19.9+0.7.
=(199999.9+0.1)+(19999.8+0.2)+(199.8+0.2)+(19.9+0.1)+0.1,
=200000+20000+200+20+0.1,
=220220.1.