化简:a-(3a-b)+(2a+3b)和二分之一m²n²-(三分之一m²n²+m²n²)

问题描述:

化简:a-(3a-b)+(2a+3b)和二分之一m²n²-(三分之一m²n²+m²n²)

a-(3a-b)+(2a+3b)
=a-3a+b+2a+3b
=4b

a-(3a-b)+(2a+3b)
=a-3a+b+2a+3b
=4b
1/2m²n²-(1/3m²n²+m²n²)
=1/2m²n²-1/3m²n²-m²n²
=(1/2-1/3-1)m²n²
=-6分之5m²n²