(1)3/4x+1/2x=9/45x/4=9/4x=9/5(2)4/5x×〔1/2+0.4〕=4.324x/5=4.32÷0.9x=4.8X5/4x=6
x=9/5解析:(3/4)x+(1/2)x=9/4(5/4)x=9/4x=9/5