数学口算练习800题
8.91+4.11= 8.95-8.15= 7.43-4.43= 8.7-4.99= 6.76+7.85= 1.1+2.83= 3.35+6.08= 6.98+1.65= 9.71-3.65= 7.3
数学口算练习800题