(1/15+1/49)11-33/49简算
问题描述:
(1/15+1/49)11-33/49简算
答
(1/15+1/49)11-33/49
=(1/15+1/49- 3/49)11
=(1/15-2/49)11
={ [49-2(15)]/49 } 11
=19x11/49
=(20-1)(10+1)/49
=(200+20-10-1)/49
=209/49能把除号写出来吗?
(15)什么意思(1/15+1/49)x11-33/49
=(1/15+1/49- 3/49)x11( 33/49 =(3/49)x11 )
=(1/15-2/49)x11
={ [49-2x15)]/49 } x11 ( 分数+,- ,通分母 )
=19x11/49
=(20-1)x(10+1)/49
=(200+20-10-1)/49
=209/49