帮我解几道比例和方程!1.2.05+7x=8.35 2.(3/5-1/3)x=2/5 3.3x-3/4x=9 4.12x-8+2/3 5.4/3x3/5=19/15 6.x-3/4x=1/8

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帮我解几道比例和方程!1.2.05+7x=8.352.(3/5-1/3)x=2/53.3x-3/4x=94.12x-8+2/35.4/3x3/5=19/156.x-3/4x=1/8帮我解几道比例和方程

帮我解几道比例和方程!1.2.05+7x=8.35 2.(3/5-1/3)x=2/5 3.3x-3/4x=9 4.12x-8+2/3 5.4/3x3/5=19/15 6.x-3/4x=1/8
帮我解几道比例和方程!
1.2.05+7x=8.35 2.(3/5-1/3)x=2/5 3.3x-3/4x=9 4.12x-8+2/3 5.4/3x3/5=19/15 6.x-3/4x=1/8

帮我解几道比例和方程!1.2.05+7x=8.35 2.(3/5-1/3)x=2/5 3.3x-3/4x=9 4.12x-8+2/3 5.4/3x3/5=19/15 6.x-3/4x=1/8
1.2.05+7x=8.35
7x=8.35-2.05
7x=6.3
x=0.9
2.(3/5-1/3)x=2/5
4/15x=2/5
4x=6
x=1.5
3.3x-3/4x=9
12x-3x=36
9x=36
x=4
4.12x-8=2/3
12x=26/3
x=13/18
5.4/3x3/5=19/15
6.x-3/4x=1/8
1/4x=1/8
x=1/2