计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)
问题描述:
计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)
答
(1)、48×1.08+1.2×56.8 =12×4×1.08+1.2×5.68×10=12×4×1.08+12×5.68=12×﹙4×1.08+5.68﹚=12×﹙4.32+5.68﹚=12×10=120(2)、72×2.09﹣1.8×73.6=18×4×2.09﹣1.8×7.36×10=18×4×2.09﹣18×7.36=1...