Lingling and Mingming measure the length of the same textbook. Lingling measures the length of 26cm, Mingming measures the length of 26.0cm. Do they measure the same result? Why?

Lingling and Mingming measure the length of the same textbook. Lingling measures the length of 26cm, Mingming measures the length of 26.0cm. Do they measure the same result? Why?

Different
The approximate accuracy of their results is different
That is to say, the reserved significant digits are different

How to solve the equation of two X? Please see the problem supplement ~ \ (≥ ▽≤) / ~ Lala
Can you give me an example? Thank you, just one example! Can you do it yourself?
Which is the fifth grade, probably: x + score x = integer, thank you!

5x-6=3x+2
5x-3x=2+6
2x=4
x=4/2
x=2

Senior one mathematics
√（½+½√（½+½cos2a））
45°

√ (& frac12; + & frac12; √ (& frac12; + & frac12; cos2a)) = √ (& frac12; + & frac12; COSA) = the absolute value of COS (A / 2)
It is the application of double angle formula
45°

Given that the real numbers x and y satisfy the inequality system X-Y + 2 ≥ 0 x + y-4 ≥ 0 2x-y-5 ≤ 0, if the only optimal solution of the objective function z = y-ax is (1,3), then the value range of the real number a is ()
A. （-∞，-1）B. （0，1）C. [1，+∞）D. （1，+∞）

If z = y-ax is changed into y = ax + Z, and Z is equivalent to the longitudinal intercept of the straight line y = ax + Z, it can be seen from the figure that if the objective function z = y-ax is maximized, the only optimal solution is B (1,3), then a > 1, so D