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)
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
=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
简算 1,728×98 2,502×73 3,67×81+34×81-81 4,275+99×275 5,125×84
81/1+81/3+81/5+81/7+81/9+81/11+81/13+81/15+81/17=
1、1/2,1/5,1/5,2/25,2/125,() 2、1/80*81+1/81*82+……+1/99*100=()
73+2(x-4)=81
1+2+3+4+5+6+7+8+9.+81+82+83+84+85+86+87+88+89+90.
1+1+1+1+2+3+4+5+6+13145201+99+81+7.2+8.8+8888+9999等于多少
化简:根号5又1/16*2又34/81
81/99^2-1/121数学题
81
(-1/81)/1/81)*(-1)-(11/8+7/3-15/4)*(-24) (-1/81)/1/81)*(-1)-
数学1-2/3-2/9-2/27-2/81-2/243-2/729 简算
9^1/6除以81^-1/4*(-27)^2/3