Question

1)-13,4×0,6+(-2,3)×3,8= 2)(2,8-5)×(-9,38+9,36)= 3) 8/9×(-3 9/16)-4 5/6×(-7/58)= 4) (4 7/8-7 1/6)×(2 1/20-0,45)=

Answer 1

-13,4*0,6+(-2,3)*3,8=-8,04-8,74=-16,78
(2,8-5)*(-9,38+9,36)=-2,2*(-0,02)=0,044
8/9*(-3 9/16)-4 5/6*(-7/58)=8/9*(-57/16)-29/6*(-7/58)=
-19/6+7/12=-38/12+7/12=-31/12= -2 7/12
(4 7/8- 7 1/6)*(2 1/20-0,45)=-2 7/24*1 3/5=-11/3= -3 2/3

Answer 2

Let's solve each of the equations step by step:

1. -13 + 4 × 0.6 + (-2.3) × 3.8

First, let's perform the multiplications: -13 + 2.4 + (-8.74)

Next, add the numbers: -13 + 2.4 - 8.74 = -18.34

2. (2.8 - 5) × (-9.38 + 9.36)

First, perform the subtractions: -2.2 × (-0.02)

Next, multiply the numbers: 0.044

3. 8/9 × (-3 9/16) - 4 5/6 × (-7/58)

Let's convert the mixed fractions into improper fractions: 8/9 × (-57/16) - 29/6 × (-7/58)

Next, multiply the fractions: (-456/144) - (-203/3484)

Simplify the fractions: (-19/6) - (203/3484)

To subtract the fractions, we need a common denominator. The least common multiple of 6 and 3484 is 10452. Let's convert the fractions:

(-19/6) × (1742/1742) - (203/3484) × (3/3) -32558/10452 + (-609/10452)

Combine the fractions: (-32558 - 609)/10452 -33167/10452

4. (4 7/8 - 7 1/6) × (2 1/20 - 0.45)

Convert the mixed fractions into improper fractions: (39/8 - 43/6) × (41/20 - 9/20)

Next, subtract the fractions: (-5/24) × (32/20)

Multiply the fractions: (-5/24) × (8/5)

Cancel out common factors: (-1/24) × 8

Simplify the fraction: -8/24 = -1/3

Final results:

1. -13 + 4 × 0.6 + (-2.3) × 3.8 = -18.34
2. (2.8 - 5) × (-9.38 + 9.36) = 0.044
3. 8/9 × (-3 9/16) - 4 5/6 × (-7/58) = -33167/10452
4. (4 7/8 - 7 1/6) × (2 1/20 - 0.45) = -1/3