计算初一负数部分的计算(-2又1/4)+(-3又3/4)(-0.25)+(+1/4)(+4又1/7)+(-2又5/7)2/5+(-3/4)(-0.5)+(-1/2)(-1/3)+(-1/2)(-4又1/4)+(-2又1/3)如果过程对的话立即加10悬赏一步一步来不要直接给答案

Question

计算 初一负数部分的计算
(-2又1/4)+(-3又3/4) (-0.25)+(+1/4) (+4又1/7)+(-2又5/7) 2/5+(-3/4)
(-0.5)+(-1/2) (-1/3)+(-1/2) (-4又1/4)+(-2又1/3)
如果过程对的话 立即加10悬赏 一步一步来 不要直接给答案

Answer 1

对于含带分数的分数,先把带分数化成假分数 ；去刮号时注意±的变化.
(-2又1/4)+(-3又3/4)=-(2*4+1)/4+[-(3*4+3)]/4.
=-9/4+[-(12+3)/4],
=-9/4+(-15/4),
=-9/4-15/4,
=-24/4,
=-6
(-0.25)+(+1/4)=(-0.25)+(+0.25),【 对于有小数,又有分数的运算式,先统一化成小数再运算】
=-0.25+0.25,
=0.
或统一化成分数后,在运算：
(-0.25)+(+1/4)=(-0.25*4/4)+(+1/4),
=(-1/4)+(+1/4),
=-1/4+1/4,
=0.
(4又1/7)+(-2又5/7)=(4*7+1)/7+[-(2*7+5)/7],
=(28+1)/7+[-(14+5)/7],
=29/7+(-19)/7,
=(29-19)/7,
=10/7,
=1又3/7.
2/5+(-3/4)=2/5-3/4 【通分,最小公分母=20】
=2*4/5*4-3*5/4*5,
=8/20-15/20,
=(8-15)/20,
=-7/20,.
(-0.5)+(-1/2)=(-0.5)+(-0.5),
=-0.5-0.5,
=-(0.5+0.5),
=-1.
(-1/3)+(-1/2)=-1/3-1/2,
=-1*2/3*2-1*3/2*3,
=-2/6-3/6,
=(-2-3)/6,
=(-5)/6,
=-5/6.
(-4又1/4)+(-2又1/3)=[-(4*4+1)/4]+[-(2*3+1)/3],
=-17/4+(-7/3),
=(-17*3/4*3)+(-7*4/3*4),
=-51/12+（-28/12),
=(-51-28)/12,
=-79/12,
=-6又7/12.