×3.5=56 0.35×1.6=。
3.5×=560 0.35×0.16=。
5.28×1.025.28 2.14×0.52.14
7.7×0.997.7×1.01 7.3×6.473×0.64
(得数保留两位小数)
2.5 ×3.7×0.4 0.9×8×1.25 78×0.36+6.4×7.8
0.62×99 72×0.81+9.19 0.81×101-0.81