1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245
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1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245
1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245
1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245
1.19,4,18,3,16,1,17,( 5 4 3 (19,4),(18,3),(16,1),(17,( )两数差都是15,所以17-15=2.2.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/25选21/25化为:3/5,6/10,10/15,15/20分子分母都构成:3,6,10,15;5,10,15,20所以分子相减构成等差:3,4,5,6,(公差1);分母构成等差(公差5).所以为21/253.9,32,75,144,( 232 238 240 245选2459,32,75,144,( 两数差是23,43,69,再两数差是20,26,32(等差,公差6所以,69+32=101,144+101=145"
1.19,4,18,3,16,1,17,( 5 4 3 22.3/5,3/5,2/3,3/4,( 17/20 19/20 21/25 23/253.9,32,75,144,( 232 238 240 245
19-18+17-16+15.-4+3-2+1
1/1*2*3+1/2*3*4+...+1/16*17*18
1,2,3,4,16,17,18,19平均分成2组,有几种分法?1,2,3,4,16,17,18,19平均分成2组,有几种分法?阿阿阿阿阿 阿
1/1*2*3+1/2*3*4+1/3*4*5+……+1/16*17*18
巧算:20+19-18-17+16+15-14-13+.4+3-2-1脱式计算
20+19-18+17+16+15-14-13+……+4+3-2-1
数字推理:19,4,18,3,16,1,17后面数字是什么?
1+2+3+4+5+19+18+17+16+15改写成乘法算式
15 17 1 3 5 31 32 18 4 6 14 16
(32*1/4+17)÷5/12 (25+3/4)÷1/4+1/4 18/25×9/16+7/25*9/16+9/16
1/17+2/17+3/17+4/17+...+15/17+16/17
x=根号17-1 求x^5+2x^4-17x^3-x^2+18x-16
16 设x=--------,求x^5+2x^4-17x^3-x^2+18x-17的值 √17+116x=--------√17+1
简便计算:20+19-18+17-16+.+3-2+1
一年级语数英题4419,4,18,3,16,1,17,( ) A.5 B.4 C.3 D.2
18又8分之7,17又4分之3,16又8分之5,( ),( ),13又4分之1,( )
有理数加法练习题,一:(+26)+(-18)+5+(-16)二:23+(-17)+6+(-22)三:(-2)+3+1+(-3)+2+(-4)