四分之三加九又四分之三加九十九又四分之三加九百九十九又四分之三等于多少,四种方法

3/4 + 9+3/4 + 99+3/4 + 999+3/4
=3/4 + 10-1/4 + 100-1/4 + 1000-1/4
=1110
=1-1/4 + 10-1/4 + 100-1/4 + 1000-1/4
=1111-4*1/4
=1110
3/4 + 9+3/4 + 99+3/4 + 999+3/4
=4*3/4 + 9+ 99+ 999
=3+ 9+ 99+ 999
=1+ 9+1+ 99 +1+ 999
=1110
3/4 + 9+3/4 + 99+3/4 + 999+3/4
=4*3/4 + 10-1+ 100-1+ 1000-1
=3+1110-3
=1110