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ket = A^4 - A^3 = A
= B - B = 0
6.) 15 X^6 ÷ [24 X^5 ÷ (-8 X^3)]
kerjakan dulu yang didalam kurung.
= 24 X^5 ÷ -8 X^3
= -3 X^2
ket = X^5 - X^3 = X^2
baru kita kerjakan yang depan
= 15 X^6 ÷ -3 X^2
= -5 X^4
ket = X^6 - X^2 = X^4
9.) -M^8 N^7 ÷ [-M^5 N^6 ÷ (-M^2 N)]
kerjakan yang di dalam kurung terlebih dahulu
= -M^5 N^6 ÷ - M^2 N
= M^3 N^5
ket = minus dibagi minus
= plus
= M^5 - M^2 = M^3
= N^6 - N = N^5
baru kita mengerjakaan pembagian yang depan
= -M^8 N^7 ÷ M^3 N^5
= M^5 N^2
ket = M^8 - M^3 = M^5
= N^7 - N^5 = N^2
12.) A^10 B^8 ÷ [-A^3 B^5 × (-A^7 B^3)]
kerjakan yang di dalam kurung terlebih dahulu
= -A^3 B^5 × -A^7 B^3
= A^10 B^8
ket = minus × minus = plus
= A^3 + A^7 = A^10
= B^5 + B^3 = B^8
baru dikerjakan yang bagian depan
= A^10 B^8 ÷ A^10 B^8
= 0
ket = A^10 - A^10 = 0
= B^8 - B^8 = 0
15.) (-X^9 Y^7 ÷ X^3 Y^4) ÷ [X^3 Y^2 × (-X^2 Y)]
kalau misalkan di dalam kurungi dua-duanya kalian pilih salah satu aja.
= -X^9 Y^7 ÷ X^3 Y^4
= -X^6 Y^3
ket = X^9 - X^3 = X^6
= Y^7 - Y^4 = Y^3
= X^3 Y^2 × -X^2 Y
= -X^5 Y^3
ket = X^3 + X^2 = X^5
= Y^2 + Y = Y^3
baru kita membagi
= -X^6 Y^3 ÷ -X^3 Y^3
= X^3
ket = minus ÷ minus = plus
= X^6 - X^3 = X^3
= Y^3 - Y^3 = 0
maaf jika jawaban saya salah.