2.6×7.8+3.6×2.2=2.6×7.8+(2.6+1)×2.2=2.6×7.8+2.6×2.2+1×2.2=2.6×(7.8+2.2)+2.2=2.6×10+2.2=26+2.2=28.2
递等式计算过程方法如下解:2.6×7.8+3.6×2.2=20.28+7.92=28.2
2.6×7.8+3.6×2.2=20.28+7.92=28.2