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脱式计算 1.58÷ [20%(15.4+6.7)]

=1.58÷(20-22.1) =1.58÷(-2.1) =-79/105

简单编了个程序,随机数,随机运算符连缀生成算式,计算结果比较麻烦,还没编明白…… 1) 70+5×4÷55 2) 86-26×19-2 3) 9×95+5-49 4) 4÷87+0+6 5) 82×98÷01÷9 6) 69-51-1-51 7) 6÷6×7×76 8) 2×4÷8×84 9) 9÷9×2÷79 10) 4-0+73+1 11) 18-6+13×6 12) 7×52÷...

1+2+3+4+5+6+7...+15+17+19 =(1+19)X[(19-1)÷2+1]÷2 =20X10÷2 =100

2012年1月28日星期六一、口算题小数加法:0.3+1.5=2.5+9.8=7.6+1.3=4.4+5.7=2.3+7.7=5.7+3.1=7.69+2.31=9.16+2.64=5.68+12.22=16.8+16.5=小数减法:6.8-3.8=4.26-3.71=0.88-2.12=5.34-69.21=68.4-61.5=9.58-3.7=18.94-5.66=15.69-9.78=115-68.59...

12/77 2/1 3/5 2/3

1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 × 5/6 + 5/6 10. 3/4 × 8/9 - 1/3 11. 7 × 5/49 + 3/14...

1.125*3+125*5+25*3+25 2.9999*3+101*11*(101-92) 3.(23/4-3/4)*(3*6+2) 4. 3/7 × 49/9 - 4/3 5. 8/9 × 15/36 + 1/27 6. 12× 5/6 – 2/9 ×3 7. 8× 5/4 + 1/4 8. 6÷ 3/8 – 3/8 ÷6 9. 4/7 × 5/9 + 3/7 × 5/9 10. 5/2 -( 3/2 + 4/5 ) 11. 7/8 + (...

(1)120×3×5=360×5=1800;(2)(36+24)×7=60×7=420;(3)350+15×4=350+60=410;(4)72÷9×25=8×25=200;(5)215-35×4=215-140=75;(6)754×(2×3)=754×6=4524.

(1)45.55-(6.82+15.55) (2)34.52-17.87-12.23(3)6.43-(1.4-0.57) (4)23.75-8.64-3.46(5)17.83-9.5-7.83-0.5 (6)5.38+88.2-2.38+1.8(7)27.38-5.34+2.62-4.66 (8)21.63-(8.5+9.63) (9)7.5-2.45+7.5+2.45 (10)0.9+0.99+0....

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