设苹果的单价是x元,由题意可得,2x+2.8×2=10.4, 2x+5.6=10.4, 2x=10.4-5.6 2x=4.8 x=2.4答:苹果每千克2.4元.
妈妈买了苹果和梨各2千克,共付10.4元。已知梨每千克2.8元,苹果每千克多少元?(10.4-2×2.8)÷2=2.4(元)
解设苹果的单价是x元2x十2.8x2=10.4
2x+2.8×2=10.42x+5.6=10.42x=10.4-5.62x=4.8x=2.4