问题 解答题 直接写出得数. 355+445=1.69-0.31=29×0.02=52-32=0.75+821×0=16+25=2-27=3.5×45=821÷4=0.5×(2.8-2.4)= 答案 355+445=800,1.69-0.31=1.38,29×0.02=0.58,52-32=16,0.75+821×0=0.75,16+25=1730,2-27=157,3.5×45=2.8,821÷4=221,0.5×(2.8-2.4)=0.2.