①12+0.4x=16
②5x-x=4.4
③4x÷1.2=0.5
④4x+8x=72
⑤1.3x-4×0.8=3.3
⑥x-5.6+4.4=6.5
①20+x=35 ②3x+6x=81 ③8x-24=80
2x+5.4=18.9 2x-2.8=9.96 (x-0.8)×4=7.2
2x+5=17 3(x-2)=12
① ② ③
⑴6x-9=33 ⑵y+3y=28.4