有理数的加减法.1-4+3-0.5,-2.4+3.5-4.6+3.5,(-7)-(+5)+(-4)-(-10),
问题描述:
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~
答
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)=-63/4-2/7+(-1/6)-(-2/3)=3/4+(-2/7)+(-1/6)+2/3=(3...