{(x)/3+(y)/2=2 {0.4x+0.7y=2.8
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{(x)/3+(y)/2=2{0.4x+0.7y=2.8{(x)/3+(y)/2=2{0.4x+0.7y=2.8{(x)/3+(y)/2=2{0.4x+0.7y=2.8x/3y/2=2(1)0.4x0
{(x)/3+(y)/2=2 {0.4x+0.7y=2.8
{(x)/3+(y)/2=2 {0.4x+0.7y=2.8
{(x)/3+(y)/2=2 {0.4x+0.7y=2.8
x/3 y/2=2 (1) 0.4x 0.7y=2.8 (2) 解方程组吗?原方程组即 2X 3Y=12 (3) 4x 7Y=28 (5)由(3)得X=(12-3Y)/2 (4) 把
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