先把左右都乘100,化减为4.4x+3.6(20-x)=76打开括号得0.8x=4.x当然=5了.
5.5%x(1-0.2)+4.5%(20-x)(1-0.2)=0.76
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相关问题
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急,怎么解 0.5x/0.2 - 1.5-x/2= 0.5 1+x/0.1 - 0.4x-0.5/0.2 = 1/2
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[4x−1.5/0.5−5x−0.80.2=1.2−x0.1].
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0.5/4x-1.5-0.02/0.5x-0.08=0.1/1.2-x+2
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(4X-1.5)/0.5-(0.5X-0.08)/0.02=(1.2-X)/0.1+2
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(4x-1.5)/0.5-(5x-0.8)/0.2=(1.2-x)/0.1-3
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解下列方程 (1)0.1x^2-0.4x-1.2=0 (2)0.5x^2+3.5x+5=0
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[0.1x+0.3/0.2]+2.5=[0.4x−1/0.5].
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不等式(2x-0.5)/0.5-(2x-1.4)/0.2>(0.5-x)/0.25
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2x-1-x/3=x+2/4-3 1/5(2x-1/3-4)=1 x-0.1/0.3-1.2=x+0.2/0.5 5x+
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x²+4x-2=0,x²-4x+1=0,(x+√5)(x-√5)=20,x²+6x+5=8x+7,25(2x-1)²-1