5.93×8.9+4.02×8.9

答

6.9＋4.8＋3.1 0.456＋6.22＋3.78 15.89＋(6.75－5.89) 4.02＋5.4＋0.98 5.17－1.8－3.2 13.75－(3.75＋6.48) 3.68＋7.56

答

（5.93+4.02）x8.9

答

5.93×8.9+4.02×8.9
=(5.93+4.02)×8.9
=9.95×8.9
=(10-0.05)×8.9
=89-0.445
=88.555

答

5.93×8.9+4.02×8.9
=(5.93+4.02)×8.9
=(10-0.05)×8.9
=89-0.445
=88.555

答

这个是根据乘法分配律来解决,观察+两边的乘法都有共同的数字8.9,先拿出来,写作8.9x(5.93+4.02)=8.9x9.95,发现还是不简便,再用一次,把9.95写成10-0.05,得8.9x（10-0.05）=8.9x10-8.9x0.05=89-0.445=88.555

答

5.93×8.9+4.02×8.9
=（5.93+4.02）x8.9
=9.95x8.9
=88.555

答

5.93×8.9+4.02×8.9
=8.9x(5.93+4.02)
=8.9x9.95
=8.9x(10-0.05)
=8.9x10-8.9x0.05
=89-0.445
=88.555