=9×(50+1)=9×50+9×1=9×50+9所以答案是9.故答案为:7,9. ①把7×89运用乘法的分配律进行解答即7×89=7×(90-1)=7×90-7×1,由此可知答案.②把9×51运用乘法的分配律进行解答,9×51=9×(50+1)=9×50+9×1,由此可知答案. 本题考点:整数的乘法及应用 考点点评: 本题考查运算定律法...
According to previous reports, the resident bought 50,000 tickets with the same numbers at lottery stations in Nanchang for the "Happy 8" seven-number game on December 2. That same night, the lottery was drawn, and...
比较大小.18×50___ 180×50 2098000___ 29800036×80___ 18×160 48000000平方米___ 48平方千米.
Joint Inversion of Body-Wave Arrival Times and Surface-Wave Dispersion Data in the Wavelet Domain Constrained by Sparsity Regularization We present models of the three-dimensional (3D) seismic attenuation structure, both Q(p) and Q(s), for a 16 km(2) area centered on the San Andreas Fault ...