Essays that didn t do well in the math test, help! Tonight s homework! Hurry up the bounty! 100

If Cf=BC is intercepted on CD and af is connected, then BCF is an equilateral triangle, BC=CF, and af bisects A

Because baf= eba=10°, bae= abf=20°, bfa aeb

So ae=bf=bc.

As gcb=40°, pass to g, and connect dg, then bgc=70°= gbc, so cg=bc=ae

Since acd= dac=20°, cd=ad, dcg=20°= dae, thus proving cdg adeTherefore, dg=de, cdg=ade

edg= edc+ cdg= edc+ ade= adc=140°, so deg= egd=20°, i.e. x=20°

Anyway, 3 7*x+2=(4 7*x-2)*3 2 There is a mistake in the problem, and there is no solution (you see if you have copied the wrong question).

That is, the lower layer +4 = 107, so the original lower layer is 103, and the upper layer 317 is the standard time faster than his clock (2 58), so after 29 hours, it is faster than 2 * 29 58 = 1 (hour), and the standard time is 6 o'clock.

120*(200-20x)>=384, solve the inequality to get x<=i.e., the tax rate is 0

<> such as the blue cover is poor, and the skin is boring.

<> arguing about the lack of hail in the rocks.

When the task is completed, A completes the collapse of eighths of the batch of parts, and B completes three-eighths of the batch of parts, and the ergonomic ratio of A and B is 3:2

When B completes 3 8, A completes: 3 8 2x3=9 16, then A hours completes: 5 8-9 16=1 16 A completes the batch of parts separately; hours).

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3x+2y=m+5(1)

2x+y=m+3(2)

1. Solution: x+y=2 from (1)-(2).

2. Solution: x+y=2

Substituting (2) yields x+2=m+3, i.e. x=m+1

Substituting (2) yields y=1-m

So m+1 1-m, i.e. m 0

3. m 2-2m 0, get 0 m 2

2m^2+5m+3

2(m^2-2m)-m+3

Because m 2-2m 0, 0 m 2

So -2(m 2-2m) 0, -m+3 0 is -2m 2+5m+3 0

So the algebraic formula -2m 2+5m+3 is positive.