估算.89×30 440÷9 35×19 297÷4378÷5 71×80 359÷6 63×29.
13×÷29÷× 15.68+(5.39+4.32) 19.68-(2.97+9.68) 7+(-) 5-(-)
1-- 41.06-19.72-20.28 7-3+ 8+2- 11+7+3 700÷14÷5 18.6÷2.5÷0.4 1.06×2.5×4
102×7.3÷5.1 17+-7
×3÷×3 25×7×4 34÷4÷1.7 1.25÷×0.8
12.06+5.07+2.9430.34+9.76-10.34