答：0.63x2.6 + 0.37x7.4
=0.63x（3-0.4） +（0.4-0.03）x7.4
=1.89-0.252+2.96-0.222
=2-0.11+3-0.04-0.474
=5-0.624
=4.376
或：
0.63x2.6 + 0.37x7.4
=（1-0.37）x2.6 +0.37x7.4
=2.6+0.37*（7.4-2.6）
=2.6+0.37*4.8
=2.6+0.37*5-0.37*0.2
=2.6+1.85-0.074
=2.6+1.776
=4.376
0.63x2.6 + 0.37x7.4的简便计算法：
0.63x2.6 + 0.37x7.4
=0.63x（3-0.4） +（0.4-0.03）x7.4
=1.89-0.252+2.96-0.222
=2-0.11+3-0.04-0.474
=5-0.624
=4.376
0.63+0.37×2.6×7.4
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