比较大小0.8x(-2.2),3x(-0.7),1.25x(1.3)
0.8x(-2.2)=-1.76
3x(-0.7)=-2.1
1.25x(1.3)=1.625
∵ -2.1＜-1.76＜1.625
∴3x(-0.7)＜0.8x(-2.2)＜1.25x(1.3)