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1(+8)+(-10)+(-2)+(+1)

来源:学生作业帮 编辑:神马作文网作业帮 分类:综合作业 时间:2024/09/20 15:23:10
1(+8)+(-10)+(-2)+(+1)
2(-5)+(+6)+(-3)+(-9)+(+4)+(+7)
3(+0.65)+(-1.9)+(-0.1)+(+0.65)
4(+1/2)+(-2/3)+(+4/5)+(-1/2)+(-1/3)
5(-10/3)+(+15.5)+(-50/3)+(-5.5)
6(+1/16)+(-3.5)+(-2.5)+(+15/16)
7(+1)+(-21/2)+(-83/37)+(-9.5)
8(+0.5)+(13/4)+(-2.75)+(+11/2)
1(+8)+(-10)+(-2)+(+1)
楼上后面两题都做错了
1(+8)+(-10)+(-2)+(+1)
=(8+1)-(10+2)
=9-12
=-3
2(-5)+(+6)+(-3)+(-9)+(+4)+(+7)
=(6+4+7)-(5+3+9)
=17-17
=0
3(+0.65)+(-1.9)+(-0.1)+(+0.65)
=0.65-1.9-0.1+0.65
=(0.65+0.65)-(1.9+0.1)
=1.3-2
=-0.7
4(+1/2)+(-2/3)+(+4/5)+(-1/2)+(-1/3)
=(1/2-1/2)+(4/5)-(2/3+1/3)
=0+4/5-1
=-1/5
5(-10/3)+(+15.5)+(-50/3)+(-5.5)
=(-10/3-50/3)+15.5-5.5
=-60/3+10
=-20+10
=-10
6(+1/16)+(-3.5)+(-2.5)+(+15/16)
=(1/16+15/16)-(3.5+2.5)
=1-6
=-5
7(+1)+(-21/2)+(-83/37)+(-9.5)
=1-(21/2+9.5)+(-83/37)
=1-(20)-83/37
=-19-2又9/37
=-21又9/37
8(+0.5)+(13/4)+(-2.75)+(+11/2)
=(0.5+11/2)+(13/4-2.75)
=6+0.5
=6.5