(15分之1+17分之2)*15*17每一部列出来哈。教教我啊
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(15分之1+17分之2)*15*17每一部列出来哈。教教我啊
(15分之1+17分之2)*15*17
每一部列出来哈。教教我啊
(15分之1+17分之2)*15*17每一部列出来哈。教教我啊
(15分之1+17分之2)*15*17
=15分之1*15*17+17分之2*15*17(根据乘法分配律)
=17+30
=47
(1/15+2/17)*15*17
全部分开
=1/15*15*17+2/17*15*17
=17+30=47
(15分之1+17分之2)*15*17
=1/15*15*17+1/17*15*17
=17+15
=32
(15分之1+17分之2)*15*17
=1/15*15*17+1/17*15*17
=17+15
=32
拆分就是
(1/15+2/17)*15*17
=1/15*15*17+2/17*15*17
=17+30
=47
(15分之1+17分之2)*15*17
=15分之1*15*17+17分之2*15*17
=1*17+2*15
=17+30
=47
(1/15+2/17)*15*17
用乘法分配律
=(1/15)*15*17+(2/17)*15*17
=17+15*2
=17+30
=47
1/1*2+1/2*3+……+1/99*100
=(1/1-1/2)+(1/2-1/3)+……+(1/99-1/100)
=1/1-1/100
=99/100
(1/15+2/17)*15*17
=1/15*15*17+2/17*15*17
=17+30
=47
1/15+2/17)*15*17 要记住用乘法分配律
=(1/15)*15*17+(2/17)*15*17
=17+15*2
=17+30
=47
1/1*2+1/2*3+……+1/99*100 思路要开阔
=(1/1-1/2)+(1/2-1/3)+……+(1/99-1/100)
=1/1-1/100
=99/100
(1/15+2/17)*15*17=(1/15)*15*17+(2/17)*15*17=17+2*15=47
(15分之1+17分之2)*15*17
=15分之1*15*17+17分之2*15*17
=17+30
=47
(1/15+2/17)*15*17
=1/15*15*17+2/17*17*15
=17+30
=47