æ以:1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+12/35
=1/3+3/4+2/5+5/7+7/8+1/4+1/5+1/3+1/7+1/3+1/8+1/5+1/7
=(1/3+1/3+1/3)+(3/4+1/4)+(2/5+1/5+1/5)+(5/7+1/7+1/7)+ (7/8+1/8)
=1+1+4/5+1+1
=4ã4/5
所以:1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+12/35
=1/3+3/4+2/5+5/7+7/8+1/4+1/5+1/3+1/7+1/3+1/8+1/5+1/7
=(1/3+1/3+1/3)+(3/4+1/4)+(2/5+1/5+1/5)+(5/7+1/7+1/7)+ (7/8+1/8)
=1+1+4/5+1+1
=4又4/5
计算:1\/3+3\/4+2\/5+7\/5+7\/8+9\/20+10\/21+11\/24+12\/35
因为9\/20=1\/4+1\/5，10\/21=1\/3+1\/7，11\/24=1\/3+1\/8，12\/35=1\/5+1\/7。所以:1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+12\/35 =1\/3+3\/4+2\/5+5\/7+7\/8+1\/4+1\/5+1\/3+1\/7+1\/3+1\/8+1\/5+1\/7 =(1\/3+1\/3+1\/3)+(3\/4+1\/4)+(2\/5+1\/5+1\/5)...
计算:1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+12\/35
=(1\/3+1\/3+1\/3)+(3\/4+1\/4)+(2\/5+1\/5+1\/5)+(7\/8+1\/8)+(5\/7+1\/7+1\/7)=4+4\/5 =4.8
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+12\/35怎么简算
=1\/3+3\/4+2\/5+5\/7+7\/8+1\/4+1\/5+1\/3+1\/7+1\/3+1\/8+1\/5+1\/7 =4\/5 小学数学简便方法归纳 1、提取公因式：这个方法实际上是运用了乘法分配律，将相同因数提取出来，考试中往往剩下的项相加减，会出现一个整数。2、借来借去法：看到名字，就知道这个方法的含义。用此方法时，需要...
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+12\/35=
解: 1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+12\/35 =1\/3+3\/4+2\/5+5\/7+7\/8+(1\/4+1\/5)+(1\/3+1\/7)+(1\/3+1\/8)+(1\/5+1\/7)=(1\/3+1\/3+1\/3)+(1\/4+3\/4)+(2\/5+1\/5+1\/5)+(5\/7+1\/7+1\/7)+(7\/8+1\/8)=4+4\/5 =4又4\/5 ...
简算:1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35 =1\/3+3\/4+2\/5+5\/7+7\/8+(4\/20+5\/20)+(3\/21+7\/21)+ (3\/24+8\/24)+(5\/35+14\/35)=1\/3+3\/4+2\/5+5\/7+7\/8+1\/5+1\/4+1\/7+1\/3+1\/8+1\/3+2\/5+1\/7 =1\/3*3+(3\/4+1\/4)+(2\/5+1\/5+2\/5)+...
计算:1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35=? 计算[(5又1\/4...
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35=91\/20 [（5又1\/4-4.25）×5\/8]÷3\/8+3.3÷1又5\/6 =52\/15
3分之1+4分之3+5分之2+7分之5+8分之7+20分之9+21分之10+24分之11+35...
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+12\/35 =1\/3+3\/4+2\/5+5\/7+7\/8+(1\/4+1\/5)+(1\/3+1\/7)+(1\/3+1\/8)+(1\/5+1\/7)=1\/3+1\/3+1\/3+3\/4+1\/4+2\/5+1\/5+1\/5+5\/7+1\/7+1\/7+7\/8+1\/8 =1+1+4\/5+1+1 =4又5分之4 ...
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35 =(1\/3+3\/4+7\/8+11\/24)+(2\/5+9\/20)+(5\/7+10\/21+19\/35)=(8\/24+18\/24+21\/24+11\/24)+(8\/20+9\/20)+(75\/105+50\/105+57\/105)=29\/12+17\/20+26\/15 =145\/60+51\/60+104\/60 =300\/60 =5 ...
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35=
9\/20可以分解成1\/4+1\/5 10\/21可以分解成1\/3+1\/7 11\/24可以分解成1\/3+1\/8 19\/35可以分解成2\/5+1\/7 所以 分母相同的数字相加 结果都是1 一共五组 结果是5 得解
1\/2+1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35.。。快点,下午作业...
1\/3+3\/4+2\/5+5\/7+7\/8+9\/20+10\/21+11\/24+19\/35 =1\/3+3\/4+2\/5+5\/7+7\/8+(4\/20+5\/20)+(3\/21+7\/21)+ (3\/24+8\/24)+(5\/35+14\/35)=1\/3+3\/4+2\/5+5\/7+7\/8+1\/5+1\/4+1\/7+1\/3+1\/8+1\/3+2\/5+1\/7 =1\/3X3+(3\/4+1\/4)+(2\/5+1\/5+2\/5)+(...
