Question

2,5²-(-3+2,5)²= ; -4,5*3 3/11*(-20)*4 7/12*(-1/40)=.

Answer 1

Ответ:

1)6

2)-9/2×36/11×(-20)×55/12×(-1/40)=-3×18×5/4×1/2=-135/4

Answer 2

Let's solve the mathematical expressions step by step:

1. $2.5^2 - (-3 + 2.5)^2$:

   $2.5^2 = 6.25$ $(-3 + 2.5)^2 = (-0.5)^2 = 0.25$

   So, $2.5^2 - (-3 + 2.5)^2 = 6.25 - 0.25 = 6$.

2. $-4.5 \times \frac{3}{11} \times (-20) \times 4 \times \frac{7}{12} \times \left(-\frac{1}{40}\right)$:

   First, let's perform the multiplications and divisions:

   $-4.5 \times \frac{3}{11} \times (-20) \times 4 \times \frac{7}{12} \times \left(-\frac{1}{40}\right) \\ = -4.5 \times -20 \times 4 \times \frac{3}{11} \times \frac{7}{12} \times \frac{1}{40} \\ = 180 \times \frac{3 \times 7}{11 \times 12} \times \frac{1}{40} \\ = \frac{21}{22} \times \frac{1}{40} \\ = \frac{21}{880}$.

So, the results are:

1. $2.5^2 - (-3 + 2.5)^2 = 6$.
2. $-4.5 \times \frac{3}{11} \times (-20) \times 4 \times \frac{7}{12} \times \left(-\frac{1}{40}\right) = \frac{21}{880}$.