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2-10m+15mn-m(3n+5)=
2-10m+15mn-3mn+5m=
(-10+5)m+(15-3)mn+2=
-5m +12mn +2
b.5x(8y-9z) dari 8y(5x-9z)=
8y(5x-9z)-5x(8y-9z)=
40xy-72yz-40xy-45xz=
(40-40)xy+-72yz+-45xz=
72yz-45xz
2.a.a2+2ab-3b2-7a2-5ab=
(1-7)a2+(2-5)ab+-3b2=
-6a2 - 3ab -3b2
b.x2-x-6+3x2-xy=
(1+3)x2+-x+-6+xy=
4x2 -x - 6 +xy=
c.3p3-2pq2+p2q-7p3+2p2q=
(3-7)p3+(1+2)p2q+-2pq2=
-4p3 + 3p2q -2pq2
d.-2(p3-2pq+q2)+3(p3+4pq-q2)=
(-2p3-4pq-2q2)+(3p3+12pq-3q2)=
(-2+3)p3+(-4+12)pq+(-2-3)q2=
p3 - 8pq - 5q2
3.18a4b:3a3b=18 per 3 a4-3 b1-1
=6 a
4.36a8b3:9a5b2=36 per 9 a8-5 b3-2
=4 a3 b
Maaf jika salah