Question

脱式计算，能用简便算法的要用简便算法．①52.32-（6+3.06）×1.5； &n...

脱式计算，能用简便算法的要用简便算法．①52.32-（6+3.06）×1.5； ②72.6×0.3+0.3×27.4；③[3.8-（1.26+0.34）]×0.45； ④11.79+7.65×2.4+10.64．

Answer 1

①52.32-（6+3.06）×1.5
=52.32-9.06×1.5
=52.32-13.59 
=38.73
         
②72.6×0.3+0.3×27.4
=0.3×（72.6+27.4）
=0.3×100
=30

③[3.8-（1.26+0.34）]×0.45
=（3.8-1.6）×0.45
=2.2×0.45
=0.99
      
④11.79+7.65×2.4+10.64
=11.79+18.36+10.64
=11.79+29
=40.79