简便运算:52.2-12.78-3.2-4.22..

问题描述:

简便运算:52.2-12.78-3.2-4.22
..

原式=(52.2-3.2)-(12.78+4.22)
=49-17
=32

原式=(52.2-3.2)-(12.78+4.22 )
=49-17
=32

=52.2-(12.78+4.22)-3.2
=52.2-17-3.
=35.2-3.2
=32

=(52-12-3-4)+(0.2-0.78-0.2-0.22)
=33+(0.2-0.2)-(0.78+0.22)
=33-0-1=32

52.2-12.78-3.2-4.22
=(52.2-3.2)-(12.78+4.22)
=49-17
=32

52.2-(12.78+4.22 )-3.2=49-17=32

52.2-12.78-3.2-4.22
=52.2-3.2-(12.78+4.22)
=49-17
=32