1、(3x-4)(2x+3)=0x=4/3或x=-3/22、x²-7/2x+(7/4)²=-3+49/16(x-7/4)²=1/16x-7/4=±1/4x=7/4±1/4x=2或x=3/23、Δ=12-12=0x=(2√3±0)/2=√3x₁=x₂=√34、Δ=16+32=48m=(8±√48)/(2√2)=(8±4√3)/(2√2)=(4±2√3)/√2=(4√2±2√6)/2=2√2±√6