4.07-1.9= 0.3+0.7= 25×4= 0.84×100= 7.8+8.5=
0.35+1.25= 5.7-4= 360÷18= 125×24= 348+99=
4.8+2.1= 6.7-0.5= 0÷280= 264-(64+23)=
9-2.9= 4.2+8= 32-2×0= 6×6÷6×6=
1800÷45= 6.4+9.6= 0.875﹣= 12×98≈
56×= 1.6×125%= ×24÷= 9+11+13+……+41=