计算.2.5+7.5= 9.8﹣0.8= 1.4+7.6=4.5+5.5= 19.8﹣9.8= 9.4+0.6=
77+93= 15×1-7= 39-100÷10= 99-77= 23-3×7= 35-35÷5=
45+28= 5×6-18= 38-0÷5= 98-23= 100-10×10= 67+10÷5=
33+67= 5×6-0= 59-0÷10= 56-0= 9-9×0= 25+40÷5=
48+43= 10×6-19= 90-90÷9= 65-49= 73-8×9= 65+45÷5=
32+78= 9×2-9= 26-54÷9= 76-47= 45-2×9= 33+35÷5=