+(4.5)-(+12)+(-4.4)-(-15)+6 怎么算用递等式 还有(-12)X(1/3-1/6+1/2)

问题描述:

+(4.5)-(+12)+(-4.4)-(-15)+6 怎么算用递等式 还有(-12)X(1/3-1/6+1/2)

+(4.5)-(+12)+(-4.4)-(-15)+6
=4.5-12-4.4+15+6
=-7.5-4.4+15+6
=-11.9+15+6
=3.1+6
=9.1
(-12)X(1/3-1/6+1/2)
=-12x1/3+12x1/6-12x1/2
=-4+2-6
=-2-6
=-8