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简算 1,728×98 2,502×73 3,67×81+34×81-81 4,275+99×275 5,125×84

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简算 1,728×98 2,502×73 3,67×81+34×81-81 4,275+99×275 5,125×84 6,35×(69×20)
简算 1,728×98 2,502×73 3,67×81+34×81-81 4,275+99×275 5,125×84
728×98
=728x(100-2)
=728x100-728x2
=72800-1456
=71344
502×73
=(500+2)x73
=500x73+2x73
=36500+146
=36646
67×81+34×81-81
=81x(67+34-1)
=81x100
=8100
275+99×275
=275x1+99x275
=(1+99)x275
=27500
125×84
=125x(80+4)
=125x80+125x4
=10000+500
=10500
35×(69×20)
=35x1380
=48300