(6.74+6.74÷6.74―6.74)x6.74
=(6.74―6.74+1)x6.74
=1x6.74
=6.74
〔1.8―1.8x(1.8―1.8)〕÷0.36
=(1.8-1.8x0)÷0.36
=1.8÷0.36
=5