5/7+19/25x4+21/25x19
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5/7+19/25x4+21/25x19
5/7+19/25x4+21/25x19
5/7+19/25x4+21/25x19
5/7+19/25x4+21/25x19
=5/7+4/25×19+21/25×19
=5/7+19×(4/25+21/25)
=5/7+19×1
=5/7+19
=19又5/7
5/7+19/25X4+21/25X19
=5/7+19/25X4+19/25X21
=5/7+19/25X(4+21)
=5/7+19/25X25
=5/7+19
=19又5/7
5/7+19/25x4+21/25x19
棉织物 21x19.5x276x268x30x137
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.+1/18x19+1/19x20 计算方法与结果
观察下列单项式:-x,3x²,-5x³,7x4次方,…,-37x19次方,39x20次方,…写出第n个单项式.观察下列单项式:-x,3x2,-5x3,7x4,…,-37x19,39x20,…写出第n个单项式.为了解决这个问题,特提供下面解题思路
4x15/2= 12/5x8= 3/1x4/1= 9/8x10= 6x12/11= 9/2x5/3= 14/6x9/7= 8/5x15/4= 20/9x21/5= 3/11x2/1= 50/19x19/10= 24/13x26/8= 40/11x22/10= 100/16x16/25= (这些是那一块的)3/1x5/3+2= 2/1+3/1x5/2= 14/9x3/1+3/2= 7/5-9/5x7/5= 1-7/5x25/21= 6/1x(5-3/2)= 8/7x
这俩道题目怎么做啊? 是 要简便的 19.97X19.98—19.96X19.99 41.2X8.1+11X9.25+537X0.19急 !今天晚上就要 若答得出来 多加分 ! 急
一道数学题:5/6-7/12+9/20-11/30+...+{18+19}/18X19-{19+20}/19X20谢谢了,
5/6-7/12+9/20-11/30+……19+18/18X19-19+20/19X20是多少?
钢丝绳 7x19-Φ6
25X4÷5=?
观察按一定规律排列的遗传单项式排列-x,2x2,-3x3,4x4...-19x19,20x20.写出第n个单项式.
1/2x3十1/3x4十1/4x5十……十1/18x19十1/19x20=?
1.1x3.3x5.5x7.7x9.9x11.11x13.13x15.15x17.17x19.19=多少
1/1X3+1/3X5+1/5X7...1/17X19+1/19X21=
15x19+21x45+15x18=?
(1)用含n的代数式表示上述式子所体现的规律.(2)请说明(1)中式子成立的理由2x4+1=9=3^26x8+1=49=7^214x16+1=225=15^217x19+1=324=18^2另注一小题5点财富值,一共10点
25X4=多少
0、25x4=?