1/4x+390=3/7x 移项得3x/7-x/4=390 合并得:(3/7-1/4)x=390 5x/28=390 x=390÷5/28 x=2184
1/4x+390=3/7x
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相关问题
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1/4x+390=3/7x 3Q
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解方程:①7X-2X=390②6.6+6x=10.2③[3/4]X+[1/2]=[2/3].
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X*(1+30%)=390
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用线性代数解x1+3x2+5x3+7x4 =12,3x1+5x2+7x3+x4=0,5x1+7x2+x3+3x4=1,7
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4x=3x+7; 12-x=3x; 3x-7=x+1.
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解方程x-3/4[x-1/4(x-3/7)]=3/16(x-3/7)
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求非齐次线性方程组:2x1-x2+4x3-3x4=-4;x1+x3-x4=-3;3x1+x2+x3=1;7x1+7x3-
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方程:3(X+2)=4(X+1) 9*3-1.7X=13.4 7X-3X=2.042 5(X+3)=20 1.4X-1.
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3/4x+1/4=3/8 x÷2/7=7/16 x+7/8x=3/
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(4.5-x)*7=17.5 x/2+4=3/2x+1 7/2*2/3-4x=7/3 5/8(x-.3)=75% 1+x