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=akar16x3 - 2akar9x3 -
akar49x3
=4akar3 - 2x3akar3 - 7akar3
=4akar3 - 6akar3 - 7akar3
=(4-6-7)akar3
=-9akar3
B. Akar32 - akar2 + akar128
=akar16x2 - akar2 + akar64x2
=4akar2 - akar2 + 8akar2
=(4-1+8)akar2
=11akar2
C. Maaf aku tdk tahu... Semoga membantu....