Simple operation: 11 × 11 × 11-11 × 11-10

Simple operation: 11 × 11 × 11-11 × 11-10

11×11×11-11×11-10=11×11×（11-1）-10=11×11×10-10=10×（11×11-1）=10×【11×（10+1）-1】=10×（11×10+11-1）=10×（110+10）=10×120=1200

Simple operation: 11 × 11 × 11-11 × 11-10

11×11×11-11×11-10=11×11×（11-1）-10=11×11×10-10=10×（11×11-1）=10×【11×（10+1）-1】=10×（11×10+11-1）=10×（110+10）=10×120=1200

How about 9 × (- 110 and 11 / 13)

9 * (- 110 and 11 / 13)
=9*（-1441/13）
=-12969/13
=-997 8 / 13

ABC three natural numbers, know the average of AB two numbers is 24, BC two numbers average is 30, AC two numbers average is 42, how much is the average of ABC three numbers?
……

a+b=24*2=48
b+c=2*30=60
a+c=2*42=84
a+b+c=(48+60+84)/2=192/2=96
(a+b+c)/3=32

In △ ABC, if ∠ a = 70 ° - B, then ∠ C is equal to?

∠A=70°-∠B
∠A+∠B=70°
∠C=180°-∠A-∠B=110°

It is known that in △ ABC, ∠ a = 70 ° - B, then ∠ C equals ()
A. 35°B. 70°C. 110°D. 140°

∵∠ a = 70 ° - ∠ B, ∵∠ a + ∠ B = 70 °, ∵∠ C = 180 ° - (∠ a + ∠ b) = 180 ° - 70 ° = 110 ° (the sum of the inner angles of the triangle is 180 °). Therefore, C is selected

It is known that in △ ABC, ∠ a = 70 ° - B, then ∠ C is equal to what degree?

∠A=70°-∠B
180-∠C-∠B=70°-∠B
∠C=110

In triangle ABC, if angle a = 35 ° and angle B = 65 °, what is angle c equal to?

Angle c equals 80 degrees

In △ ABC, we know that a = 8, B = 60 degrees, C = 70 degrees, then B is equal to
The answer should not be decimal

A=180-60-70=50
Sine theorem: A / Sina = B / SINB
b=asinB/sinA=8*sin60/sin50=9.044