2/15÷(1.1-3/4)+1/5X3/5

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2/15÷(1.1-3/4)+1/5X3/5
2/15÷(1.1-3/4)+1/5X3/5

2/15÷(1.1-3/4)+1/5X3/5
2/15÷(1.1-3/4)+1/5X3/5
=2/15÷(1.1-0.75)+3/25
=2/15÷0.35+3/25
=2/15÷3/20+3/25
=2/15X20/3+3/25
=8/9+3/25
=200/225+27/225
=227/225

2/15÷(1.1-3/4)+1/5X3/5
=2/15÷(22/20-15/20)+3/25
=2/15÷7/20+3/25
=2/15*(20/7)+3/25
=40/105+3/25
=200/525+63/525
=263/525

都化为分式:
2/15÷(11/10-3/4)+3/25
=2/15÷(44/40-30/40)+3/25
=2/15÷14/40+3/25
=2/15x40/14+3/25
=8/21+3/25
=(200+63)/21x25
=263/525
=0.5

2/15÷(1.1-3/4)+1/5X3/5
=2/15÷(22/20-15/20)+3/25
=2/15*20/7+3/25
=8/21+3/25
=200/525+63/525
=263/525

2/15÷(1.1-3/4)+1/5X3/5
=2/15÷7/20+3/25
=8/21+3/25
=200/525+63/525
=263/525

2/15÷(1.1-3/4)+1/5X3/5 用初等行变换来解下列线性方程组(1)2x1-x2+3x3=3 3x1+x2-5x3=0 4x1-x2+x3=3 x1+3x2-13x3=-6(2) x1-2x2+x3+x4=1 x1-2x2+x3-x4=-1 x1-2x2+x3-5x4=5(3) x1-x2+x3-x4=1 x1-x2-x3+x4=0 x1-x2-2x3+2x4=-1/2 (5^4x3^3-5^3x3^2+5^2x3)÷15=? 1+2x3-4÷5= 1.证明(8-7x-6x2+x3)+(x3+5x2+4x-1)-(-x2-3x+2x3-3)的值与x无关.快, 判断下列非齐次线性方程组是否有解,有解时,求其一般解(1)2x1+3x2-2x3=1 x1-x2+3x3=1 5x1+3x2-x3=3 (2) 3x1+x2+4x3-3x4=2 2x1-3x2+x3-5x4=1 5x1+10x2+2x3-x4=21大哥, 求下列线性方程组的解(1)x1+2x2+x3=6,x2+4x3=6,4x2+x3=9(2)x1+x2+x3=5,2x1+3x2+x3=9,x2+4x3=9 需要具体的解答方程式 X3-3X+1=0 求X3+1/X3 设x=(1-√5)÷2则√(x3-1÷x3)x3就是x³ (-5)x3又3分之1+2x3又3分之1+(-6)x3又3分之1 解方程组 X1-X2-4X3=-1 X2+X3=2 X1+X2-2X3=3线性代数 {2X1-X2+3X3=33X1+X2-5X3=04X1-X2+X3=3X1+3X2-13X3=-6{X1-2X2+3X3-4X4=4X2-X3+X4=-3X1+3X2-3X4=1-7X2+3X3+X4=-3 因式分解(1+x+x2+x3)2-x3 2x3+3x2-4x-1 1.用基础解系表示线性方程组的通解X1 +2X2+3X3-X4=13X1+2X+X3-X4=1 2X1+3X2+X3+X4=12X1+2X2+2X3-X4=15X1+5X2+2X3=22.3 1 0A= -4 -1 0 的特征值和特征向量.4 -8 2 1.用基础解系表示线性方程组的通解X1 +2X2+3X3-X4=13X1+2X2+X3-X 若x1,x2,x3的平均数为5,则x1-4,x2-4,x3-4的平均数是:x1+1,x2+2,x3+3的平均数是: 求证:无论X取何值下列(8-7X-6X2+X3)+(X3+5X2+4X-1)-(-X2-3X+2X3-3)结果不变 -(3分之2)2次方x3-2x(-3分之2)÷3分之2)+ 4(-1.5)2次方