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简便方法计算题1/2×2/5+9/25÷9/20

1/2×2/5+9/25÷9/20 =1/5+9/25×20/9 =1/5+4/5 =1

记得好评哦

这种题要整360道?出题的人也太弱智了吧?

20-1/4×2/5×5/6 =20-1/10×5/6 =20-1/12 =19又12分之11; (7/16+4/5)÷3/5 =(7/16+4/5)×5/3 =35/48+4/3 =(35+64)/48 =99/48 =33/16; 18/25×9/10+7/25×9/10+9/10 =9/10×(18/25+7/25+1) =9/10×2 =9/5; 解方程x-3/8x=5/10 5x/8=5/10; x=4/5; 9x÷1/2...

9.8X25 =(10-0.2)X25 =10X25-0.2X25 =250-5 =245

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 + (...

. 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 ...

4.25x0.45-1/2x9/20+9/4÷20/9 =4.25x9/20-0.5x9/20+2.25x9/20 =(4.25-0.5+2.25)x9/20 =(4.25+2.25-0.5)x9/20 =(6.5-0.5)x9/20 =6x9/20 =3x9/10 =27/10 =2.7 谢谢,请采纳

1/3+2/5+3/7+9/20+11/28+17/30+25/42 =(1/3+17/30)+(2/5+9/20)+(3/7+11/28)+25/42 =9/10+17/20+23/28+25/42 =5/4+23/28+25/42 =29/14+25/42 =8/3 =2又2/3

如图

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