(1/15+1/49)11-33/49简算
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(1/15+1/49)11-33/49简算
(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
再问: 能把除号写出来吗?
(15)什么意思
再答: (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
=(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
再问: 能把除号写出来吗?
(15)什么意思
再答: (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
简算49又 1/11*1/6
1/49+3/49+5/49+7/49+9/49+11/49+13/49 简便运算 还求思路 急...
1,9,11,15,17,19,21,27,33,35,37,41,45,49,57,65,72,81质数有
(1/15+3/49)*15-1/49 简便计算
(15分之1+49分之3)×15-45÷49
用简便方法计算:49^10*(1/49)^11
1,9,11,15,17,19,21,27,33,35,37,41,45,49,57,65,72,81合数有,偶数有,3
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 57 49 41 43
倍数与因数1 9 11 15 17 19 21 27 33 35 37 41 45 49 57 65 72 81 质数有
16-1=15,25-4=21,16-9=27,49-16=33,.
16-1=15;25-4=21;36-9=27;49-16=33,.
英语 英语 (2 11:1:49)