12×4+7=55, 58-9÷3=55,12×6+5=77,82-5÷1=77.
12x4 + 7=5557- 6÷3=5512x6+5=7784-7÷1=77精锐长宁天山数学组为您解答！
17 3 458 6 236 2 584 7 1
17×3+4=5558-6÷2=5524×3+5=7783-6÷1=77
