3.8×2.6×9=3.8×2.6×10-3.8×2.6×1=4×26-0.2×26-4×2.6+0.2×2.6=104-5.2-10.4+0.52=104-15.6+0.52=104-16+0.4+0.52=88.92
3.8×2.6×9=9.88×9=88.92
