(82/9+15/8-41/7)÷(82/9+23/8-48/7)简便算法

(82/9+15/8-41/7)÷(82/9+23/8-48/7)简便算法 （82/9+15/8-41/7）÷﹙82/9-48/7+23/8 82×9÷82×9简便运算 11.88*41-82*10分之9简算 怎样用matlab作数据的最小二乘拟合时间(小时) 0.25 0.5 0.75 1 1.5 2 2.5 3 3.5 4 4.5 5酒精含量 30 68 75 82 82 77 68 68 58 51 50 41时间(小时) 6 7 8 9 10 11 12 13 14 15 16 酒精含量 38 35 28 25 18 15 12 10 7 7 4 15÷4分之9×5分之3简便计算（6分之5-5分之4+15分之1）×309分之5÷12分之7×10分之77分之6×9分之8÷7分之6×9分之82-9分之2-15分之7÷5分之3能简便就简便 matlab求曲线拟合参数x=[0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16]y=[30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4]求A和B的值 请问该如何编写程序. 请问matlab中nlinfit拟合函数怎么用>> t = [0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16];>> y = [30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4];拟合出k1,k2,k3,函数是这样的： matlab中inline函数的使用问题代码如下：>> t=[0.25,0.5,0.75,1,1.5,2,2.5,3,3.5,4,4.5,5,6,7,8,9,10,11,12,13,14,15,16];>> c2=[30,68,75,82,82,77,68,68,58,51,50,41,38,35,28,25,18,15,12,10,7,7,4];>> f=inline('a(1)*exp(-a(3)*t)*((exp(a(3)*t)-1)/a 急,matlab曲线拟合问题,有这两组数据t=[ 0.25; 0.5; 0.75; 1; 1.5; 2; 2.5; 3; 3.5; 4; 4.5; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16 ];c=[ 30; 68; 75; 82; 84; 77; 70; 68; 58; 51; 50; 41; 38; 35; 28; 25; 18; 15; 12; 10; 7; 7; 4 ];拟合出如 matlab lsqcurvefit 函数的使用函数 function y=fun2(x,tdata)y=2/(1/x(1)+2*exp(-x(2)*tdata)*x(3));主程序tdata=[0.25 0.5 0.75 1 1.5 2 2.5 3 3.5 4 4.5 5 6 7 8 9 10 11 12 13 14 15 16];ydata=[30 68 75 82 82 77 68 68 58 51 50 41 38 35 28 25 18 15 1 82又19分之8除以9 8点82除以9等于多少 数字81格,每格数字1--9不能重复*9***41*2*8*7***642**531***6*7*2*45***93*82***28*5*3*6***215**354***6*2***29***7* 7×101 5.5×9.8 82×0.9 0.36×0.25 100-15×4.6 2.04×52 9＋5.29 (1)0,2/3,8/3,4/15,24/5,( )(2)1,6,21,46,31,111,( )(3)1/3,5/9,2/3,13/21,( )(4)6,37,9,82,0,1,1.01,( )(5)1,1,3,7,17,41,( ) 能做几道做几道.第一题：,2,41,6,,9,7,8,4,6,12,852,6,7,7428,9,639,1,24,2,59,,1,3,768,871,3第二题,9,41,,8,7,642,531,6,7,2,45,,93,82,,28,5,3,6,215,354,6,2,,29,7, 数列82/9