初一数学填空题和计算题 填空:在1,-1,-2这三个数中,任意两书之差的最大值是()计算:(-40)-(+28)-(-19)-(+32)1/2-(+2/3)-(-1/2)-(-4/3)(-3又1/4)-[(-3又1/4)+(+5又1/3)]1/4-2/15+2/3+1/5-5/6-3/4(-4)-2-{(-5)-[(-7)+(-3)-(-8)]}|3-4|+(-5-5)-|-1+5|-(5-20)
问题描述:
初一数学填空题和计算题
填空:
在1,-1,-2这三个数中,任意两书之差的最大值是()
计算:
(-40)-(+28)-(-19)-(+32)
1/2-(+2/3)-(-1/2)-(-4/3)
(-3又1/4)-[(-3又1/4)+(+5又1/3)]
1/4-2/15+2/3+1/5-5/6-3/4
(-4)-2-{(-5)-[(-7)+(-3)-(-8)]}
|3-4|+(-5-5)-|-1+5|-(5-20)
答
①在1,-1,-2这三个数中,任意两书之差的最大值是(-1-[-2]=1)
②(-40)-(+28)-(-19)-(+32)
=-40-28+19-32
=-100﹢19
=-81
③1/2-(+2/3)-(-1/2)-(-4/3)
=½-⅔+½+4/3
= 1﹢⅔
=1⅔
③(-3又1/4)-[(-3又1/4)+(+5又1/3)]
=-13/4+13/4+5⅓
=5⅓
④(-4)-2-{(-5)-[(-7)+(-3)-(-8)]}
=-4-2-[-5+7+3-8]
=-6-﹙10-13﹚
=-6﹢3
=-3
⑤|3-4|+(-5-5)-|-1+5|-(5-20)
=1-10-4﹢15
=2