420÷5×16
×3÷×3 25×7×434÷4÷1.7 1.25÷×0.8
12.06+5.07+2.94 30.34+9.76-10.34
1.3×11.6-1.6×1.3 1--
(48×75×81)÷(24×25×27) 7.5×2.3+1.9×2.55-(-) 19.68-(2.97+9.68)
34×3535-35×3434 27000÷125345345÷15015 347+358+352+349