78÷678÷3 25×4025×39+25 1×2×31+2+3
62×7×362×21 480÷8240÷4 85÷575÷5
88+8.8= 90÷5= 0.1÷0.2= 0.12×0.8= 0.3²=
÷10= ×0.25= - = + = ×7÷ ×7=