90÷ ( 3.6 -1.8 ) 3.6÷0.4 - 1.2×5=90÷1.8=50=9 - 6=3 3.4×7.8÷3.90.36÷[ ( 6.1 - 4.6 )×0.8)]=26.52÷3.9=6.8=0.36÷ ( 1.5×0.8 )=0.36÷1.2=0.3