问题
解答题
计算:(1)3(2m-
(2)-7y+(2y-3)-2(3y+2). |
答案
(1)3(2m-
)1 3
=3×2m-3×1 3
=6m-1.
(2)-7y+(2y-3)-2(3y+2)
=-7y+2y-3-2×3y+(-2)×2
=-7y+2y-3-6y-4
=(-7+2-6)y-7
=-11y-7.
计算:(1)3(2m-
(2)-7y+(2y-3)-2(3y+2). |
(1)3(2m-
)1 3
=3×2m-3×1 3
=6m-1.
(2)-7y+(2y-3)-2(3y+2)
=-7y+2y-3-2×3y+(-2)×2
=-7y+2y-3-6y-4
=(-7+2-6)y-7
=-11y-7.