计算题:(有理数的减法) 12.3-7.2+(-2.3)-(-15.2)(请列出算式来,

问题描述:

计算题:(有理数的减法) 12.3-7.2+(-2.3)-(-15.2)
(请列出算式来,

12.3-7.2+(-2.3)-(-15.2)
= (12.3-2.3)+(15.2-7.2)
= 10+8
= 18

12.3-7.2+(-2.3)-(-15.2)
=(12.3+15.2)-(7.2+2.3)
=27.5-9.5
=18

原式=12.3-7.2-2.3+15.2=18

12.3-2.3-7.2+15.2=10+8=18

12.3-7.2-2.3+15.2=18

12.3-7.2+(-2.3)-(-15.2)
=(12.3+15.2)-(7.2+2.3)
=27.5-9.5
=18