1.一杯水:(1.1-0.74)÷(5-3)
=0.36÷2
=0.18(kg)
瓶重:0.74-0.18×3
=0.74-0.54
=0.2(kg)
2.一袋牛奶:(12.85-5.35)÷(50-20)
=7.5÷30
=0.25(kg)
纸箱:5.35-0.25×20
=5.35-5
=0.35(kg)
希望对你有帮助,望采纳.
1.一杯水:(1.1-0.74)÷(5-3)
=0.36÷2
=0.18(kg)
瓶重:0.74-0.18×3
=0.74-0.54
=0.2(kg)
2.一袋牛奶:(12.85-5.35)÷(50-20)
=7.5÷30
=0.25(kg)
纸箱:5.35-0.25×20
=5.35-5
=0.35(kg)
希望对你有帮助,望采纳.