13﹢X=28.2解方程
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![13﹢X=28.2解方程](/uploads/image/f/81785-65-5.jpg?t=13%EF%B9%A2X%EF%BC%9D28.2%E8%A7%A3%E6%96%B9%E7%A8%8B)
5.4X+X=12.86.4x=12.8x=2X-0.36X=160.64x=16x=25
2x(4x+13)=78x²+26x=78x²+26x-7=0(2x+7)(4x-1)=0X1=-7/2,X2=1/4
(x+1)(x+3)+4x=-13x方+4x+3+4x+13=0x方+8x+16=0(x+4)方=0x1=x2=-4
21.3=35.1x-x21.3=34.1xx=21.3÷34.1x=213/341(341分之213)(21.3-X)*X=35.121.3X-X²=35.1X²-21.3X+3
4/3x=20x=15
把x=-2带入方程5a+x=13得5a-2=13a=3则原方程为5×3-x=13解得:x=2原方程解为2
8.8x+x=989.8x=98x=10
(1)35x+x=20, 1.6x=20, &n
(x²-4)(x²-9)=0(x-2)(x+2)(x-3)(x+3)=0则:x=-2或x=2或x=-3或x=3
X+13%X-28%X=3.4X+0.13X-0.28X=3.40.85X=3.4X=3.4/0.85X=4
7.5x+4.5x=2012x=20x=5/3
①13x+20%×6=7.2, 13x+1.2=7.2, &
6^x+4^x=9^x3^x*2^x+(2^x)^2=(3^x)^2,两边同除以(2^x)^2,(3/2)^x+1=[(3/2)^x]^2,设(3/2)^x=t,t+1=t^2,t^2-t-1=0,t
x=12.7+13
原式=2.1X-1X=111.1X=11X=11/1.1X=10
X^2+4X=60X^2+4X+2^2=60+2^2(X+2)^2=64X+2=8X=6
24x+x=025x=0-025x=0x=0
13-(X+5)=16913-x-5=1698-x=169-x=161x=-161
X²-3X=0X(X-3)=0X=0或X=3
13x-x=18.9(13-1)x=18.912x=18.9x=1.575