{7x+6y=-19,6y-5x=17解方程组
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{7x+6y=-19,6y-5x=17解方程组
{7x+6y=-19,6y-5x=17解方程组
{7x+6y=-19,6y-5x=17解方程组
7x+6y=-19,6y-5x=17
x= -3, y= 1/3
The snake is a long and thin animal that lives in grass or other dark places. 蛇是一种又长又瘦的动物,生活在草丛里和阴暗的地方、A snake has no legs or feet, but it can move very fast on its stomach.蛇没有腿和脚,靠胃部飞快的移动前进。 Snakes u...
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The snake is a long and thin animal that lives in grass or other dark places. 蛇是一种又长又瘦的动物,生活在草丛里和阴暗的地方、A snake has no legs or feet, but it can move very fast on its stomach.蛇没有腿和脚,靠胃部飞快的移动前进。 Snakes usually have green, yellow or black skins, which make them difficult for their enemies to find them. 蛇常常有绿色,黄色和黑色的皮肤,使得敌人很难找到他们。Some kinds of snakes live in water. They can swim as freely as fish.有些蛇生活在水里,他们能像鱼一样飞速的游移。
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相减得12x=-36,x=-3
代入7*(-3)+6y=-19。6y=2,y=1/2
7x+6y=-19 ①
6y-5x=17 ②
①-②得 12x=-36
x=-3
将x=-3代入②得 y=1/3
所以,原方程组的解是:
x=-3
y=1/3{m+2n-9=0,6m十2n+1=0怎么写??m+2n-9=0, ①
6m十2n+1=0 ②
②-①得 5m...
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7x+6y=-19 ①
6y-5x=17 ②
①-②得 12x=-36
x=-3
将x=-3代入②得 y=1/3
所以,原方程组的解是:
x=-3
y=1/3
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7x+6y=-19,两边同乘以5得35x+30y=-95
6y-5x=17 两边同乘以7得-35x+42y=119
两式相加得72y=24,
y=1/3
x=-3