Jawaban:
a. -5
b. 24
c. -78
d. -35
e. 73
Penjelasan dengan langkah-langkah:
a. -12 + 7 = -5
b. 10 - (-14) = 10 + 14 = 24
c. -25 + (-53) = -25 - 53 = -78
d.15 + ..... = -20
.... umpamakan sbg x berarti
15 + x = -20
x = -20 - 15
x = -35
pembuktian => 15 + (-35) = 15 - 35 = -20 (benar)
jadi ... tersebut bernilai -35
e. .... + (-23) = 50
x + (-23) = 50
x = 50 + 23
x = 73
pembuktian => .... + (-23) = 73 + (-23) = 73 - 23 = 50 (benar)
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Jawaban:
a. -5
b. 24
c. -78
d. -35
e. 73
Penjelasan dengan langkah-langkah:
a. -12 + 7 = -5
b. 10 - (-14) = 10 + 14 = 24
c. -25 + (-53) = -25 - 53 = -78
d.15 + ..... = -20
.... umpamakan sbg x berarti
15 + x = -20
x = -20 - 15
x = -35
pembuktian => 15 + (-35) = 15 - 35 = -20 (benar)
jadi ... tersebut bernilai -35
e. .... + (-23) = 50
.... umpamakan sbg x berarti
x + (-23) = 50
x = 50 + 23
x = 73
pembuktian => .... + (-23) = 73 + (-23) = 73 - 23 = 50 (benar)