(-3.75)-2.85+(-1又4分之1)-(-1又2分之1)+3.15-(-2.5)
= -3.75-2.85-1.25+1.5+3.15+2.5
= -(3.75+1.25+2.85)+(1.5+2.5+3.15)
= -7.85+7.15
= -0.7
-6.6+(-1.25)-(-1.5)+5.65=-5.1+4.4=-0.7
(-3.75)-2.85+(-1又4分之1)-(-1又2分之1)+3.15-(-2.5)
=-3.75-2.85-1.25+1.5+3.15+2.5
=-3.75-1.25+1.5+2.5-2.85+3.15
=-5+4-2.85+3.15
=-3.85+3.15
=-0.7
(-3.75)-2.85+(-1又4分之1)-(-1又2分之1)+3.15-(-2.5)
=(-3.75-1又4分之1)+(1又2分之1+2.5)+(3.15-2.85)
=-5+4+0.3
=-0.7
简便运算下 不行就硬算