有理数的加减法.1-4+3-0.5,-2.4+3.5-4.6+3.5,(-7)-(+5)+(-4)-(-10),
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/08/24 10:28:21
有理数的加减法.1-4+3-0.5,-2.4+3.5-4.6+3.5,(-7)-(+5)+(-4)-(-10),
3/4-2/7+(-1/6)-(-2/3).要用地等式,和加法结合律来写地等式 55555大虾帮帮忙吧就这几道,过几天开学了~
3/4-2/7+(-1/6)-(-2/3).要用地等式,和加法结合律来写地等式 55555大虾帮帮忙吧就这几道,过几天开学了~
1-4+3-0.5
=(1+3)+[-4+(-0.5)]
=4+(-4.5)
=-(4.5-4)
=-0.5
-2.4+3.5-4.6+3.5
=[-2.4+(-4.6)]+(3.5+3.5)
=-7+7
=0
(-7)-(+5)+(-4)-(-10)
=(-7)+(-5)+(-4)+10
=-16+10
=-(16-10)
=-6
3/4-2/7+(-1/6)-(-2/3)
=3/4+(-2/7)+(-1/6)+2/3
=(3/4+2/3)+[-2/7+(-1/6)]
=17/12+(-19/42)
=17/12-19/42
=119/84-38/84
=27/28
=(1+3)+[-4+(-0.5)]
=4+(-4.5)
=-(4.5-4)
=-0.5
-2.4+3.5-4.6+3.5
=[-2.4+(-4.6)]+(3.5+3.5)
=-7+7
=0
(-7)-(+5)+(-4)-(-10)
=(-7)+(-5)+(-4)+10
=-16+10
=-(16-10)
=-6
3/4-2/7+(-1/6)-(-2/3)
=3/4+(-2/7)+(-1/6)+2/3
=(3/4+2/3)+[-2/7+(-1/6)]
=17/12+(-19/42)
=17/12-19/42
=119/84-38/84
=27/28
有理数的加减法.1-4+3-0.5,-2.4+3.5-4.6+3.5,(-7)-(+5)+(-4)-(-10),
有理数的加减法.初中有理数加减法:3/4-2/7+(-1/6)-(-2/3)-1.不能直接就等.
..(有理数的加减法)
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