1. 4r^4÷4rs²=r³/s²
2. 25x^4y^6÷25x^4y^5=y
3. (x+y)²=x²+2xy+y²
4. 7a^5b^3c^5÷14a²b³c=½a³c^4
5. 8a^4b³c÷2a²b³×(-2/3a³bc²)=4a²c×(-2/3a³bc²)=-8/3a^5bc³
6. 9x^4y²×(-15xy³)÷(-9x^4y²)
=(9×15÷9)x^(4+1-4)y^(2+3-2)
=15xy³
1 4r^4÷4rs²=r³/s²
2 25x^4y^6÷25x^4y^5=y
3 (x+y)²=x²+2xy+y²
4 7a^5b^3c^5÷14a²b³c=½a³c^4
5 8a^4b³c÷2a²b³×(-2/3a³bc²)=4a²c×(-2/3a³bc²)=-8/3a^5bc³
6 9x^4y²×(-15xy³)÷(-9x^4y²)
=(9×15÷9)x^(4+1-4)y^(2+3-2)
=15xy³
。!谢谢。打次方在字母上面的吖。
写的太乱了,看不懂