3又5分之4*0.375+3.8除以8+2分之1除以19分之5计算

问题描述:

3又5分之4*0.375+3.8除以8+2分之1除以19分之5计算

原式
=3.8x3/8+3.8x1/8+1/2×19/5
=3.8x(3/8+1/8)+3.8x1/2
=3.8x1/2+3.8x1/2
=3.8x(1/2+1/2)
=3.8x1
=3.8