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5x(x+7)(x+4)=5x(x2+11)

(1)3x+2×7=503x+14=50 3x++14-14=50-14 3x=36 3x÷3=36÷3 x=12;(2)12(x+3.7)=14412(x+3.7)÷12=144÷12 x+3.7=12 x+3.7-3.7=12-3.7 x=8.3;(3)5x-3×11=42 5x-33=42 5x-33+33=42+33 5x=75 5x÷5=75÷5 x=15;(4)7.2x-3.6x=9×0.4 3.6x=3....

x1-x2+x4=2 x1-2x2+x3+4x4=3 两式相加得 2x1-3x2+x3+5x4=5 因为同时2x1-3x2+x3+5x4=λ+2 两个方程的左边相等,要使方程有解,则方程的右边也相等 5=λ+2,λ=3 所以当λ=3时,方程组有解 x1-x2+x4=2 x1-2x2+x3+4x4=3 将x3,x4看作是已知量,移项得 x1-x2=2...

解.将条件方程与原方程组构成新的方程组,得增广矩阵:1?52?3?11?31?42??5?1?90?4?17536?1??1→1?52?3?110?142?7?280?142?7?28028?414?56→1?52?3?110?142?7?280000?00000?0

十四分之一减去x等于七分之二x

f(x)=7x3+3x2-5x+11=x(x(7x+3)-5)+11则v0=7v1=7×23+3=164v2=164×23-5=3767v3=3767×23+11=86652,故在运算过程中下列数值不会出现的是D.故选D.

A+2B=(x^3-5x^2)+2(x^2-11x+6) =x^3-5x^2+2x^2-22x+12 =x^3-3x^2-22x+12.

解: A=矩阵[1,3,12 ;1,2,4;1,1,1] B=(12,8,5) X=(x1,x2,x3) AX=B X=A^(-1)*B (A,E)转换: A^(-1)=0.4000 -1.8000 2.4000 -0.6000 2.2000 -1.6000 0.2000 -0.4000 0.2000 X=2.4000 2.4000 0.2000 A1=x1+x2+x3 A2=3x1+2x2+x3 A3=12x1+4x2+x3 Z=2....

solve('5*x^5-3*x^3+x^2+11=0') ans = -1.3130542889642530668937203100181 0.64872718956017354755182357313527*i + 1.0201526764802407097363499549923 - 1.0070470829409015158691709440101*i - 0.36362553199811417628948979998319 1.007047...

15X-2.5=11.5 15X=11.5+2.5 15X=14 X=14/15; 3(x+2)=39 X+2=39/3 X+2=13 X=13-2 X=11 x-(3/5)x=6/5 (5/5-3/5) x=6/5 (2/5)x=6/5 2x=6 x=6/2 x=3 4.9÷7/2-5x=0.8 0.7/2=5x+0.8 5x=0.7/2-0.8 5x=0.35-0.8 x=-0.45/5=-0.09 8/5÷x=16 8/5=16x x=(8/5...

5x+4y+z=0 3x+y-4z=11 x+y+z= -2 4x+3y=2 7x+5y=3 20x+15y=10, 21x+15y=9 x=-1 y=2 z=-3

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