当m=8.4,n=4.5时,求7m+8n-7(m-n)的值,帮帮忙,谢谢啦

2025-05-14 14:03:41
推荐回答(3个)
回答1:

m=8.4,n=4.5时,求7m+8n-7(m-n)
=7*8.4+8*4.5-7(8.4-4.5)
=自己算

回答2:

7m+8n-7(m-n)
=7m+8n-7m+7n
=15n
=15x4.5
=67.5

回答3:

m=8.4, n=4.5

7m+8n-7(m-n)
=7m+8n-7m+7n
=15n
=15*4.5
=67.5