829
1. 163²+163*37=163(163+37)=163*200=32600
2. 197²-197*97=197(197-97)=197*100=19700
3. 0,8³+0,8*9,36=0,8(0,8²+9,36)=0,8*10=8
4. 0,7³-0,49*2,7=0,7²(0,7-2,7)=-2*0,49=-0,98
834.
1. =(a²-b²)(x+y)=(a-b)(a+b)(x+y)
2. =(b³+c²)(x-y)
3. =(m+n)(x²+y²)
4. =(a²-3+b)(a²-3)
5. =(x-y)(a²+4b)
6. =(x²+y³)(x³+y²)