必须要简便计算8.15*(12.75-8.95) 5.26*3.1-2.1*1.38 1.65*1.025.23*0.76+52.3*0.024 96.51*3.1*4.95-3.1 2.3*0.98

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必须要简便计算8.15*(12.75-8.95) 5.26*3.1-2.1*1.38 1.65*1.025.23*0.76+52.3*0.024 96.51*3.1*4.95-3.1 2.3*0.98
必须要简便计算
8.15*(12.75-8.95) 5.26*3.1-2.1*1.38 1.65*1.02
5.23*0.76+52.3*0.024 96.51*3.1*4.95-3.1 2.3*0.98

必须要简便计算8.15*(12.75-8.95) 5.26*3.1-2.1*1.38 1.65*1.025.23*0.76+52.3*0.024 96.51*3.1*4.95-3.1 2.3*0.98
8.15×(12.75-8.95)
=8.15×{(12.75-8.75)-0.2}
=8.15×{4-0.2}
=8.15×4-8.15×0.2
=32.6-1.63
=30.97