三位数合数等于13有哪些答:139,148,157,166,175,184,193,229,238,247,256,265,274,283,292,319,328,337,346,355,364,373,382,391,409,418,427,436,445,454,463,472,481,490,508,517,526,535,544,553,562,572,580,607,616,625,634,643,652,661,670,706,715,724,733,742,751,760,805,814,823,832,841,...
100以内合数有哪些?答:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97 有口诀吗?质数与合数是一个什么观念,一百以内质数口诀是什么质数(primenumber)又称素数,有无限个。质数定义为在大于1的自然数中,除了1和它本身以外不再有其他因数。
请问:1到100的合数有几个?答:合数是指除了1和它本身外还能被其他数整除的数,例如4是合数因为它能被2整除,6是合数因为它能被2和3整除。而1到100之间的质数有25个,因此1到100之间的合数就是100-25 = 75个。具体来说,1到100的合数包括:4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, ...