1.15×(10.5+0.74)＝1.15×(10+0.5+0.74)＝1.15×(10+1.24)＝1.15×10+1.15×1.24＝11.5+1.426＝12.926
解: 1.15×(10.5+0.74)= 1.15×11.24=12.926
