13+25= 2×5= 50-6= 4×5+4=
35+34= 5×5-15= 18+16= 3×5-6=
小刚解决的数学问题是:
500-213= 10÷10%= 0.25+2.83= 1.25×0.8= 3.7-3.7÷3.7=
92-33= + = × = 9÷ = ( - )×20=