987654321+87654321+7654321+654321+54321+4321+321+21+1=?
观察下面一组算式后再写右边的数字.21×9=189 54321×9= 321×9=2889 654321×9=?
987654321+987654321-987654321=
654321X909090+654321+909090=?
1234567-7654321*1234567\7654321=?
1+1234*4321*4321*1234
1234567+1234567-7654321+1234567-7654321=?
123456+654321=?
1234567+7654321=?
1234567乘7654321=?
1234567×7654321=几
987654321-123456789=多少
1234567890*987654321=?