Question

2/3+0,4-2/3+0,6= (2/5+1/7)×(-35)=

Answer 1

2/3+0,4-2/3+0,6= 2/3-2/3+0,4+0,6=0+1=1; (2/5+1/7)*(-35)=19/35*(-35)=-(19/35*35)=-19

Answer 2

To solve the given expression step by step, let's break it down:

Step 1: Simplify the expression on the left side: 2/3 + 0.4 - 2/3 + 0.6

First, let's combine the fractions: 2/3 - 2/3 = 0

Now, let's add the decimal numbers: 0.4 + 0.6 = 1

So, the left side simplifies to 1.

Step 2: Simplify the expression on the right side: (2/5 + 1/7) × (-35)

First, let's find a common denominator for the fractions: The common denominator for 5 and 7 is 35.

Now, let's convert the fractions: 2/5 = 14/35 (multiplied numerator and denominator by 7) 1/7 = 5/35 (multiplied numerator and denominator by 5)

Now, we can add the fractions: 14/35 + 5/35 = 19/35

Finally, let's multiply the fraction by -35: 19/35 × (-35) = -19

So, the right side simplifies to -19.

Step 3: Combine the results from the left and right sides: 1 + (-19) = -18

Therefore, the final answer to the given expression is -18.