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1.2x+2.8x=10.4

1.2x+2.8x=10.4 解:4x=10.4 x=10.4÷4 x=2.6

2X+2.8x2=10.4 解: 2x+5.6=10.4 2x=10.4-5.6 2x=4.8 x=2.4 验算:方程左边2X+2.8x2 =2×2.4+5.6 =10.4 =方程右边 所以:2.4是方程2X+2.8x2=10.4的解。

x=2

请采纳

x=5 1又3x/4-x/2=6.25 (1又3x/4-x/2)x4=6.25x4 4+3x-2x=25 x=21 3.错了吧 一、(1/4-0.2)÷1又2/3=1/20÷5/3=0.03 二、(45×40%-6)/2=5

x=-2代入X=4cos(2πt+1/3π)得:cos(2πt+1/3π)=-1/2,所以t=1/6

1:2:4=10:x:y, 所以1:2=10:x,x=2×10÷1=20, 1:4=10:y,y=4×10÷1=40, 所以答案是x=20,y=40

很想帮你,对不起,现在没纸写字,打字又很麻烦

3/5x-1/6=2/3 2x+0.8=4 解:3/5x-1/6+1/6=2/3 +1/6 解: 2x=4-0.8 3/5x=2/3 +1/6 x=1.6 3/5x=5/6 3/5x÷3/5=5/6÷3/5 x=1/2 0.4x(x-1.2)=1.2 解: x-1.2=3 x=3+1.2 x=4.2 10/9x-1/3x=21 解: 7/9x=21 x=21x9/7 x=27 3/4x-1/2=1/4 解: 3/4x-1/2+1/...

60%x-3/8=11.625 60%x-0.375=11.625 60%x=12 x=20 (x+2.8)×2=10.4 x+2.8=5.2 x=2.4 8x÷(1.8+3)=1 8x÷4.8=1 8x=4.8 x=0.6

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