Subject: addition of rational numbers. Find the sum: 1) - 7 + (-8). 2) - 4 67 + (-2 37). 3) - 56 + (78). If that is possible step by step.

273
Remember one rule - and + it is and - it is (+) + and + it (+) + and - it. 1). in the first example we turn on signs, in our case at us two negative numbers at once, it is-7 and-8.-7+(-8 turn out) = minus minus plus means we put numbers and in pered we put a minus sign and =-15. 2).:-24 drob7+ (-6 drob7) = 7= in numerators we write-24 fractions 7 - 6 fractions-24-6/and to denominators 7... and it is equal-4 whole 2/7. 3).: in numerators-20+21, and in denominators 24 and it is equal to 1/24. Rada was to help!:)
340
Answer add