(-8ab)(34a2b),
=-8×34a3b2,
=-6a3b2.
选择通达模型
一日三餐(早、中、晚餐)的合理热量配比为()。
A.30%,40%,30%
B.30%,30%,40%
C.20%,40%,40%
D.40%,40%,20%