7+2+6= 2+5+1= 8+3+3= 5+5+7=6+8+4= 4+9+5= 2+7+4= 9+4+6=
210-60= 420+50= 630+40= 880-80= 670+80= 750-80=
240-80= 420+70= 760+80= 870-50= 650+70= 740-70=
120-70= 370+90= 350+80= 910-50= 560+40= 650-70=
27+67= 10×6-8= 39-0÷10= 88-23= 45-5×9= 25+0÷5=
77+93= 15×1-7= 39-100÷10= 99-77= 23-3×7= 35-35÷5=