解方程:(2x²-3)(x 4)=x-4 2x(x² 4x-3)
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(2x-16)x4/5=x+16(2x-16)x4=5(x+16)(两边同乘以5)8x-64=5x+80(去括号)3x=80+64=144(移项合并同类项)x=144/3=48所以方程解为x=48
5%x+(300-x)x4%=135x+(300-x)x4=13005x+1200-4x=1300x=1300-1200x=100
∵|x-2|=0,∴x=2,把x=2代入方程3x+8=x4−a,即可得到:6+8=12-a;解得:a=-272.
2.8x4+5x=17.211.2+5x=17.25x=17.2-11.25x=6x=6÷5x=1.2
2x+8.5x2=352x+17=352x=35-172x=18x=912.5x4-3x=23x=50-23x=48x=16
①(20-X)x4+2X=5080-4x+2x=502x=30x=15②7x-(10-x)×5=227x-50+5x=2212x=72x=6③8x+(15-x)×6=1008x+90-6x=1002x
4x+1.5x4=564x+6=564x=50x=25/2
∵(4x+1)(3x+1)(2x+1)(x+1)=3x4,⇒[(4x+1)(x+1)][(2x+1)(3x+1)]=3x4,⇒(1+5x+4x2)(1+5x+6x2)=3x4,设t=5x2+5x+1,
2X+8×4-4X=26∴-2X=26-32解得:X=3
2x+(20-X)X4=642x+80-4x=644x-2x=80-642x=16x=8
0.9x-4X1.3=1.10.9x-5.2=1.10.9x=1.1+5.20.9x=6.3x=71.3X7=25.1-8x9.1=25.1-8x8x=25.1-9.18x=16x=24.8+0.5x
X^4+2X^2-1=0(x^2-1)^2=0x^2-1=0x^2=1x=+-1
2x4次方-7x3次方+2x2次方+7x+2=0则2x⁴-4x³-2x²-3x³+6x²+3x-2x²+4x+2=02x²(x&
3x-2X4+2x=12.53x+2x-8=12.55x=12.5+85x=20.5x=4.1
x1-x2+x4=2x1-2x2+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,
0.9x--4x1.3=1.10.9x-5.2=1.10.9x=6.3x=71.3x7=25.1-8x9.1=25.1-8x8x=16x=24.8+0.5x=6.30.5x=1.5x=3(25+2x)
1-2x-56=3-x4-2x+4x=3-1+562x=58x=58/2
3/4x-11/20x4=2两边乘2015x-44=4015x=44+4015x=84x=5.6
原式=(X4-2X2+1)+2*(X3-2X2+X)=(X2-1)^2+2*X(X-1)^2=(X-1)^2(X+1)^2+2*X(X-1)^2=(X-1)^2((X+1)^2+2X)=(X-1)^2
(12.5+12.5%)x4=5x5x=50+0.5x=10+0.1x=10.1