Question

計算：5.6×69.32+138.64×0.05+693.2×0.43

Answer 1

 5.6×69.32+138.64×0.05+693.2×0.43
=5.6×69.32 +（138.64÷2）×（0.05×2）+（693.2÷10）×（0.43×10）
=5.6×69.32+69.32×0.1+69.32×4.3
=69.32 ×（5.6+0.1+4.3）
=69.32×10
=693.2