(1.25+2.5)x4 ;5.32x7.2+4.68×7.2

(1.25+2.5)x4 ;5.32x7.2+4.68×7.2 这几道题怎么简算?1.99.9X7+11.1X372.4.2X4.2+0.42X583.1.25X(8+0.8+0.8) 有整数x1,x2,x3,x4,x5,x6,x7.x1 x8+x7+x6 +x5+x4+x3+x2+x+1因式分解 x8+x7+x6+x5+x4+x3+x2+x+1因式分解 简便运算.8.8x7.8+3.3x4.4 1/1x4+1/4x7+…+1/97x100 简便运算.8.8x7.8+3.3x4.4,急 5分之3x4分之9x7分之5 2.5x7.8+7.4x7.8+0.78 3.236x(-7)+(-3.264)x7-(-2.5)x7 简便计算 1.0.125X8.8 2.10.1X8.3 3.（2.5+25）X4 4.3.57X3.7+3.57X7.3 1、3.6/4-1.2x52、90/(3.6-1.8)3、(31.6-11.7)/2.5/0.44、3.4x7.8/3.95、5.23x4+4.77/0.25 (9.1X4.8x7.5)/(2.5X1.3X1.6) 68.3-（24.2-11.7） 0.125/(3.6/80)x0.9 三题求简算!/ 是除号~= =不好意思 x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x 已知有一列数x1,x2,x3,...,x7,且x1=8,x7=5832,x1/x2=x2/x3=x3/x4=x4/x5=x5/x6=x6/x7=x7/x8,求x5的值, 一道用matlab求解的线性规划问题z=x1+x2+x3+x4+x5+x6+x7x1+x4+x5+x6+x7>=50x1+x2+x3+x6+x7>=50x1+x2+x3+x4+x7>=50x1+x2+x3+x4+x5>=80x2+x3+x4+x5+x6>=90x3+x4+x5+x6+x7>=90 帮我用lingo或者lindo算个题呗?x1+x4+x5+x6+x7>20x1+x2+x5+x6+x7>13x1+x2+x3+x6+x7>10x1+x2+x3+x4+x7>12x1+x2+x3+x4+x5+>16x2+x3+x4+x5+x6+>18x3+x4+x5+x6+x7>20格式不对也改下哈,>在lingo中应该和>=一样吧?min=(5x1+4x2+3x3+3x4+3x5+3x6+4x7)