1.规定a▽b=B分之A减A分之B,求2▽(5▽3)+15分之8之值.2.49/(7777777*7777777)3.4649.05/0.7*1.6*0.4/3.2*1.54.1986-1983+1980-1977+…………+12-9+6-35.30*30-29*29+28*28-27*27+26*26-25*25+……+2*2-1*16.1-1/10-1/100-1/1000-1/10000-
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![1.规定a▽b=B分之A减A分之B,求2▽(5▽3)+15分之8之值.2.49/(7777777*7777777)3.4649.05/0.7*1.6*0.4/3.2*1.54.1986-1983+1980-1977+…………+12-9+6-35.30*30-29*29+28*28-27*27+26*26-25*25+……+2*2-1*16.1-1/10-1/100-1/1000-1/10000-](/uploads/image/z/14925488-32-8.jpg?t=1.%E8%A7%84%E5%AE%9Aa%E2%96%BDb%3DB%E5%88%86%E4%B9%8BA%E5%87%8FA%E5%88%86%E4%B9%8BB%2C%E6%B1%822%E2%96%BD%EF%BC%885%E2%96%BD3%EF%BC%89%2B15%E5%88%86%E4%B9%8B8%E4%B9%8B%E5%80%BC.2.49%2F%EF%BC%887777777%2A7777777%EF%BC%893.4649.05%2F0.7%2A1.6%2A0.4%2F3.2%2A1.54.1986-1983%2B1980-1977%2B%E2%80%A6%E2%80%A6%E2%80%A6%E2%80%A6%2B12-9%2B6-35.30%2A30-29%2A29%2B28%2A28-27%2A27%2B26%2A26-25%2A25%2B%E2%80%A6%E2%80%A6%2B2%2A2-1%2A16.1-1%2F10-1%2F100-1%2F1000-1%2F10000-)
1.规定a▽b=B分之A减A分之B,求2▽(5▽3)+15分之8之值.2.49/(7777777*7777777)3.4649.05/0.7*1.6*0.4/3.2*1.54.1986-1983+1980-1977+…………+12-9+6-35.30*30-29*29+28*28-27*27+26*26-25*25+……+2*2-1*16.1-1/10-1/100-1/1000-1/10000-
1.规定a▽b=B分之A减A分之B,求2▽(5▽3)+15分之8之值.
2.49/(7777777*7777777)
3.4649.05/0.7*1.6*0.4/3.2*1.5
4.1986-1983+1980-1977+…………+12-9+6-3
5.30*30-29*29+28*28-27*27+26*26-25*25+……+2*2-1*1
6.1-1/10-1/100-1/1000-1/10000-……-1/1000000000
7.333387又2分之1*79+790*66661又4分之1
8.2/21+2/77+2/165+2/285+……2/1677+2/2021
9.比1/2大,比5小,分母是13的最简分数的和是多少?
1.规定a▽b=B分之A减A分之B,求2▽(5▽3)+15分之8之值.2.49/(7777777*7777777)3.4649.05/0.7*1.6*0.4/3.2*1.54.1986-1983+1980-1977+…………+12-9+6-35.30*30-29*29+28*28-27*27+26*26-25*25+……+2*2-1*16.1-1/10-1/100-1/1000-1/10000-
1.根据定义得15/8
2.简单的约分吧,别的我想不到,1111111的负二次方
3.全部用分数表示如46490.05/0.7=13283/2,其余类推,约分得13283/20
即6640.15
4.两两结合,就成了3+3+3+3.+3共661个,得1983
5.利用a*a-b*b=(a+b)(a-b),即59+55+51+.+7+3等比数列得465
6.即1-(1/10+1/100+1/1000+.+1/1000000000)括号内是等比数列,的 1/9*(8+10的9次方的倒数)
7.用假分数表示,会发现规律,注意提取79,的79000000
8.注意裂项求和,看21=3*7,77=7*11,165=11*15,285=15*19,.,2021=43*47,得22/141
9.(6+7+8+9+10+.+64)-(13+26+39+52)=1935.所以得1935/13
可能算错,验算一下!