Soal Aljabar Kelas 8.
Soal Aljabar Kelas 8.
Soal Aljabar kelas 7.
GBU FULL.....
Jawaban :
III. Pemecahan Masalah
1. a + b = 383
a-b = 107
maka a = 107 + b, dan 107+ b + b = 383,
2b + 107 = 383
2b = 276
b= 276: 2= 138,
a = 107 + 138 = 245
H = 245 - 2.(138) = -31.
2. p = (2x-3)cm, l = (x+3)cm,
k = 2(p+l) = 42 cm
2((2x-3)+(x+3))= 42,
6x =42,
x =7, maka
p= (2x-3)=14-3 =11 cm, l = (x+3)= (7+3) = 10 cm
L = 11 cm x 10 cm = 110 cm2
1. a + b = 383
a-b = 107
maka a = 107 + b, dan 107+ b + b = 383,
2b + 107 = 383
2b = 276
b= 276: 2= 138,
a = 107 + 138 = 245
H = 245 - 2.(138) = -31.
2. p = (2x-3)cm, l = (x+3)cm,
k = 2(p+l) = 42 cm
2((2x-3)+(x+3))= 42,
6x =42,
x =7, maka
p= (2x-3)=14-3 =11 cm, l = (x+3)= (7+3) = 10 cm
L = 11 cm x 10 cm = 110 cm2
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