有理数的加减混合运算求解题!
|-2|-(-0.125)-(-25又5分之三)-|-5又八分之七|-25.6|-0.25|+(-3又四分之一)-(-0.75)+|-0.125|+(+八分之七)就帮忙回...
|-2| -(-0.125)-(-25又5分之三)-|-5又八分之七|-25.6
|-0.25|+(-3又四分之一)-(-0.75)+|-0.125|+(+八分之七)
就帮忙回答最后的两道题 谢谢了 我很笨 展开
|-0.25|+(-3又四分之一)-(-0.75)+|-0.125|+(+八分之七)
就帮忙回答最后的两道题 谢谢了 我很笨 展开
1个回答
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1、
|-2| -(-0.125)-(-25又5分之三)-|-5又八分之七|-25.6
=(+2)-(-0.125)-(-25.6)-(+5.875)-(+25.6)
=(+2)-[(-0.125)+(-5.875)]-[(-25.6)+(+25.6)]
=(+2)-(-6)-0
=(+2)+(+6)
=+8
2、
|-0.25|+(-3又四分之一)-(-0.75)+|-0.125|+(+八分之七)
=(+0.25)+(-3.25)+(+0.75)+(+0.125)+(+0.875)
=[(+0.25)+(-3.25)]+(+0.75)+[(+0.125)+(+0.875)]
=(-3)+(+0.75)+(+1)
=(-2.25)+(+1)
=-1.25
|-2| -(-0.125)-(-25又5分之三)-|-5又八分之七|-25.6
=(+2)-(-0.125)-(-25.6)-(+5.875)-(+25.6)
=(+2)-[(-0.125)+(-5.875)]-[(-25.6)+(+25.6)]
=(+2)-(-6)-0
=(+2)+(+6)
=+8
2、
|-0.25|+(-3又四分之一)-(-0.75)+|-0.125|+(+八分之七)
=(+0.25)+(-3.25)+(+0.75)+(+0.125)+(+0.875)
=[(+0.25)+(-3.25)]+(+0.75)+[(+0.125)+(+0.875)]
=(-3)+(+0.75)+(+1)
=(-2.25)+(+1)
=-1.25
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