0.53+9.9*9.8+0.45 简便计算
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0.53+9.9*9.8+0.45 简便计算
0.53+9.9*9.8+0.45 简便计算
0.53+9.9*9.8+0.45 简便计算
0.53+9.9*9.8+0.45
=0.53+0.45+9.9*9.8
=0.98+99*0.98
=0.98*(1+99)
=0.98*100
=98
0.53+9.9*9.8+0.45
=(0.53+0.45)+99x0.98
=0.98+99x0.98
=(1+99)x0.98
=100x0.98
=98
2*0.49—>0.1*9.8,另问问几年级了?