Question

计算（7倍根号54-3倍根号21+4倍根号15）乘以根号3

Answer 1

解原式=（21√6-3√21+4√15）*√3
=63√2-9√2+12√5
=54√2+12√5

Answer 2

（7√54﹣3√21＋铅滑4√15）×√3
=（7√6×√9-3√7×√3+4√5×√槐迅腊3）×√3
=（21√2×√3-3√7×√3+4√5×√3）×√3
=63√2－9√昌迟7+12√5