2.4:0.25=0.4:x解比例
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4x+0.5=7.54x=7.5-0.54x=7x=7÷4x=1.750.25x+3=0.3x0.3x-0.25x=30.05x=3x=3÷0.05x=600.4(x-16)=15.2x-16=15.
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15(x-0.4)=12(x+0.25)15x-6=12x+315x-12x=3+63x=9x=3
X-0.25X=30.75X=3X=4
12x=8(x+1)12x=8x+812x-8x=84x=8x=29.8-2.4X=3.2X+4.2-2.4x-3.2x=4.2-9.8-5.6x=-5.6x=1
2.4x=x+74.92.4x-x=74.91.4x=74.9x=74.9÷1.4x=53.5
首先合并同类项0.8x+32=x然后移项(注意要变号)32=x-0.8x再合并同类项(将方程两边交换位置,这步不用变号)0.2x=32两边都除以0.2x=160
(1)X\0.02-2.4=1.9X\0.02=4.3X=0.086(2)6(X-+2.5)=13X-2X5X=15X=3(3)13.92(4)16.72+7.48-2.2=22(5)移动后是原来的1
方程是啥?如果为:x^0.75-x^0.25=0.75令t=x^0.25,则x^0.75=t^3方程化为:t^3-t=0.75,解得:t=1.26255112740716x=t^4=2.5409486
解方程一:0.25x-0.2x=180.3x+x=690.05x=181.3x=69x=360x=13分之690
0.25x+0.4x+0.25x+16=xx-0.25x-0.4x-0.25x=160.1x=16x=16÷0.1x=160
0.3x+7x-0.25x=21.257.05x=21.25705x=2125x=425/141
(2.4-1)x=9.81.4x=9.8x=9.8÷1.4x=7
x/15+0.4=x/12-0.25;4x+24=5x-15;x=39;
第一步:把含x的项全部移到左边(注意:移项时要变号)1.2x-2.4x-1.2x=-60第二步:合并同类项:-2.4x=-60第三步:把系数化为1(即:把等式两边同除以-2.4)得:x=25
9x-5x=21.64x=21.6x=5.4再答:2.4x+4x=12.86.4x=12.8x=2再答:x-0.36=32x=32+0.39x=32.36
18*(x-0.4)=12*(x+0.25)18x-18*0.4=12x+12*0.2518x-12x=7.2+36x=10.2x=1.7
5(x+1)=-0.25(x+1)^2-4.75(x+1)^2+20(x+1)+19=0(x+1+19)(x+1+1)=0(x+20)(x+2)=0x=-2或-20
x-0.25x=2.40.75x=2.4x=2.4÷0.75x=3.2