——速算达人的摇篮，让数学学习变得简单、有趣、高效！
0.8×0.2= 0.4×0.4= 0.6×0.7= 0.8×0.8= 0.1×0.6= 0.1×0.5= 0.7×0.2= 0.4×0.7= 0.8×0.3= 0.3×0.6= 0.5×0.8= 0.2×0.7= 0.6×0.1= 0.6×0.6= 0.6×0.2= 0.7×0.9= 0.2×0.5= 0.1×0.1= 0.9×0.6= 0.1×0.4= 0.7×0.5= 0.7×0.1= 0.8×0.5= 0.3×0.8= 0.9×0.1= 0.4×0.2= 0.2×0.9= 0.5×0.9= 0.3×0.4= 0.2×0.8= 0.1×0.3= 0.3×0.3= 0.1×0.8= 0.6×0.8= 0.8×0.1= 0.9×0.5= 0.3×0.2= 0.7×0.3= 0.9×0.3= 0.3×0.7= 0.4×0.1= 0.9×0.8= 0.5×0.1= 0.3×0.1= 0.7×0.8= 0.5×0.7= 0.8×0.7= 0.2×0.6= 0.4×0.6= 0.5×0.3= 0.7×0.4= 0.5×0.2= 0.1×0.2= 0.8×0.9= 0.4×0.9= 0.9×0.7= 0.3×0.9= 0.5×0.4= 0.6×0.4= 0.2×0.1= 0.3×0.5= 0.7×0.6= 0.2×0.3= 0.5×0.6= 0.6×0.3= 0.9×0.4= 0.8×0.6= 0.9×0.2= 0.7×0.7= 0.9×0.9= 0.8×0.4= 0.4×0.3= 0.4×0.8= 0.6×0.9= 0.6×0.5= 0.1×0.7= 0.1×0.9= 0.4×0.5= 0.5×0.5= 0.2×0.2= 0.2×0.4=