计算(-2a3+3a2-4a)(-5a5)等于（）A.10a15-15a10

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问题选择题

计算(-2a³+3a²-4a)(-5a⁵)等于（）

A.10a¹⁵-15a¹⁰+20a⁵
B.-7a⁸-2a⁷-9a⁶
C.10a⁸+15a⁷-20a⁶
D.10a⁸-15a⁷+20a⁶

答案

答案：D

选择题

I want to know ______ the day after tomorrow. [ ]

A. what the teacher will do

B. what will the teacher do

C. what the teacher did

D. what did the teacher do

单项选择题

下列化合物中（）是碱。

A.氯化钾

B.氢氧化钾

C.硫酸

D.氟利昂