6x²-7x=1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
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6x²-7x=1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
一定要用配方法 .
太密了、.6x²-7x+1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
一定要用配方法 .
太密了、.6x²-7x+1=0 5x²-18=9x 4x²-3x=52 5x²=4-2x
6x²-7x+1=0→x²-7x/6+1/6=0→[x²-7x/6+(7/12)²]-25/144=0→(x-7/12)²=25/144→x=±5/12+7/12即x=1或x=1/6;
5x²-18=9x→x²-9x/5-18/5=0→[x²-9x/5+(9/10)²]-441/100=0→(x-9/10)²=441/100→x=±21/10+9/10即x=3或x=-6/5;
4x²-3x=52→x²-3x/4-13=0→[x²-3x/4+(3/8)²]-841/64=0→(x-3/8)²=841/64→x=±29/8+3/8即x=4或x=-13/4;
5x²=4-2x→x²+2x/5-4/5=0→[x²+2x/5+(1/5)²]-21/25=0→(x+1/5)²=21/25→x=±√21/5-1/5即x=√21/5-1/5或x=-√21/5-1/5.
5x²-18=9x→x²-9x/5-18/5=0→[x²-9x/5+(9/10)²]-441/100=0→(x-9/10)²=441/100→x=±21/10+9/10即x=3或x=-6/5;
4x²-3x=52→x²-3x/4-13=0→[x²-3x/4+(3/8)²]-841/64=0→(x-3/8)²=841/64→x=±29/8+3/8即x=4或x=-13/4;
5x²=4-2x→x²+2x/5-4/5=0→[x²+2x/5+(1/5)²]-21/25=0→(x+1/5)²=21/25→x=±√21/5-1/5即x=√21/5-1/5或x=-√21/5-1/5.
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1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980
1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少