12.5 + 0.25 = 12.75 1001 − 269 = 732 2.05 × 17 = 34.85 8.84÷1.7=88.4÷17=5.2 567.7+78.75=6.45 18.2 − 9.02 = 9.18 66 × 57 = 3762 210 ÷ 14 = 15
0.987 + 13.78 = 14.767 345 − 199 = 146 37 × 14 = 518 7000 ÷ 14 = 500 123.98 + 47.36 = 171.34 1000.11 − 276.78 = 723.33 87 ÷ 30 = 2.9
208 × 16 = 3328 18.78 + 9.674 = 28.454 98.03 − 6.98 = 91.05 305 × 33 = 10065
60 ÷ 18 = 3.3（小数点后面的3上面点个点，表示3循环）
