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12.15-x+x+17-x+3=32
15+17-x+3=32
35-x=32
-x=32-35
-x=-3
x=3
14.-5x2+7xy+y2 A
15 2a+3b-5+(6a-4b+9)
2a+3b-5+6a-4b+9
8a-b+4
16.c
17.3x/8+x/4+x/2
disamain penyebutnya =
3x/8+2x/8+4x/8
9x/8D
18.-x3+2x2+18x/-x-4
x2-4x+9
19.luas erik=sxs=(x+2)(x+2)=x2+2x+2x+4
x2+4x+4
luas tohir=(x+8)(x-2)
=x2-2x+8x-16
=x2+6x-16+x2+4x+4
=2x2+10x-14
luas katon mereka adalah 2x2 +10x-14
MAAF KALAU SALAH