计算(或解方程)下面各题,能简算的要简算. 0.125×32×2.50.8×6.3-0.8×3.82x+10.5=26.5x÷(

2025-02-10 09:52:48
推荐回答(1个)
回答(1):

①0.125×32×2.5
=0.125×(8×4)×2.5
=(0.125×8)×(2.5×4)
=1×10
=10

②0.8×6.3-0.8×3.8
=0.8×(6.3-3.8)
=0.8×2.5
=2

③2x+10.5=26.5
2x+10.5-10.5=26.5-10.5
       2x÷2=16÷2
           x=8

④x÷(3.4×0.5)=30
          x÷1.7=30
     x÷1.7×1.7=30×1.7
               x=51

⑤43x-2x=30.75
     41x=30.75
 41x÷41=30.75÷41
       x=0.75

⑥120-2x=45.6
   120-2x+2x=45.6+2x
2x+45.6-45.6=120-45.6
       2x÷2=74.4÷2
           x=37.2