①(x+1.7)×2=9.2, (x+1.7)×2÷2=9.2÷2, x+1.7=4.6, x+1.7-1.7=4.6-1.7, x=2.9; ②8x-4x=0.64, x(8-4)=0.64, 4x=0.64, 4x÷4=0.64÷4, x=0.16; ③2x-0.24=0.12, 2x-0.24+0.24=0.12+0.24, 2x=0.36, 2x÷2=0.36÷2, x=0.18; ④7x+2.5X=3.8. x(7+2.5)=3.8, 9.5x=3.8, 9.5x÷9.5=3.8÷9.5, x=0.4. |