Question

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÷（

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÷（3.4×0.5）=3043x-2x=30.75120-2x=45.6．

Answer 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