十字写不了.或者说很麻烦 自己用求根公式算△,都开不出整数,所以用求根没意义.
有例子x²+6x-7|| ||x × 7=7x\ =6xx × -1=-x/(x-1)(
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相关问题
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1×6+2x+3(40-6-7-x)+4×7=100
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解方程:5x-2=3.6;7(x-1.2)=2.1;7.5×8-4x=20;9.6x-2.4x=21.6;4x-7×1.
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有点挑战性!X7X X3X XXX8XX 2X6 XXX2XX 1XX 6XX48X 5X7 3XX7XX XXX XX
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19x-8x=55 2×(7x-4x)=18 6x+8x=1.4×3 5x+0.1x=50+6.1 7.2x-3.6x=
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19x-8x=55 2×(7x-4x)=18 6x+8x=1.4×3 5x+0.1x=50+6.1 7.2x-3.6x=
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求未知数x1.X-5/7X=1/14 2.X×(5/6+0.625)=7/203.2/3X+0.75X=1/6 4.6×
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数学题1/4x1/5x1/6+1/5x1/6x1/7+1/6x1/7x1/8+.+1/98×1/99×1/100=?
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①1=-(x-1)/2+(x-2)/6-(x+2)/3 ②2/7×(3x-7)=2-1.5x
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2.1X+7.9X=6.9 5X+0.8×2=7.12X+5.8=8.2 6X-3×4=1.2