数学题快(-8)+10+2+(-1)(-6)+3+9+(-4)+(-7)用简便运算
问题描述:
数学题快(-8)+10+2+(-1)(-6)+3+9+(-4)+(-7)用简便运算
(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51 1+(-1/2)+1/3+(-1/6) 1/2+(-2/3)+4/5+(-1/2)-(+1/3)
1
全部都要用简便计算
1 (-8)+10+2+(-1) 2.(-6)+3+9+(-4)+(-7) 3.(-0.8)+1.2+(-0.7)+(-2.1) 1+ 1/2+1/3+(-1/6) 5.1/2+(-2/3)+4/5+(-1/2)+(-1/3)
答
(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51=1.2+3.51-2.8=4.71-2.8=1.811+(-1/2)+1/3+(-1/6)=1/2+1/6=2/31/2+(-2/3)+4/5+(-1/2)-(+1/3)=4/5-1/3=7/15(-8)+10+2+(-1)=12-9=3(-6)+3+9+(-4)+(-7)=12-17=-5(-...