6.90.99×6.9 3.99x 13.99 12.712.7×1.8
1.234×0.6780.678 4.98+0.7894.98×0.789
1.26×0.03=
0.99×4.894.89 19.9x119.9 8.26x1.028.26
5.5×2.1=
5.5×=1.155
9.38×0.99.38 1×0.680.68
3.8×1.013.8 2.36×1.523.6×0.15
3.2×5.6=5.6× 0.125×3.2=0.125××
5.5×10.1=5.5×+5.5×
×=38.5
×=3.85
385÷=0.385
10000999 1.87×0.951.87
÷ a×1.5a÷ (a>0)