3a^2b-[2a^2b-(2abc-a^2才)-4a^2c]-2abc,其中a=0.1b=70,c=10
问题描述:
3a^2b-[2a^2b-(2abc-a^2才)-4a^2c]-2abc,其中a=0.1
b=70,c=10
答
3a²b-[2a²b-(2abc-a²c)-4a²c]-2abc=3a²b-2a²b+2abc-a²c+4a²c-2abc=a²b+3a²c=0.1²×70+3×0.1²×10=0.7+0.3=1