7/10×9+7/10=? (2/3+4/9)×18=? 97×5/96=? (2/7+1/3)×3×7=?
问题描述:
7/10×9+7/10=? (2/3+4/9)×18=? 97×5/96=? (2/7+1/3)×3×7=?
用简便方法计算(要过程)
答
1.原式=7/10×〖1+9〗=7
2.原式=2/3×18+4/9×18=12+8=20
3.未知
4.〖2/7×7〗×3+〖1/3×3〗×7=6+7=13第3题呢?