5x+15x=( + ) x=20x 5ab-2ab+ab=( - + )ab=(
问题描述:
5x+15x=( + ) x=20x 5ab-2ab+ab=( - + )ab=(
答
(5+15)
(5-2+1)
(4ab)
答
5x+15x=(5+15 ) x=20x 5ab-2ab+ab=( 5-2 +1 )ab=(4ab )急呀!!!
答
5x+15x=(5 +15 ) x=20x
5ab-2ab+ab=( 5- 2+1 )ab=( 4ab)