解方程4x²+2=7x,快
问题描述:
解方程4x²+2=7x,快
答
4x²+2=7x4x²-7x+2=04(x²-7x/4+7²/8²)-4*7²/8²+2=04(x-7/8)²-49/16+2=04(x-7/8)²=17/16(x-7/8)²=17/64x-7/8=±(√17)/8x=7/8±(√17)/8...
解方程4x²+2=7x,快
4x²+2=7x4x²-7x+2=04(x²-7x/4+7²/8²)-4*7²/8²+2=04(x-7/8)²-49/16+2=04(x-7/8)²=17/16(x-7/8)²=17/64x-7/8=±(√17)/8x=7/8±(√17)/8...