用递等式计算怎么做谢谢
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54*50+46*50
=(54+46)*50
=100*50
=5000
99*45
=(100-1)*45
=100*45-1*45
=4500-45
=4455
102*78
=(100+2)*78
=100*78+2*78
=7900+156
=7956
=(54+46)*50
=100*50
=5000
99*45
=(100-1)*45
=100*45-1*45
=4500-45
=4455
102*78
=(100+2)*78
=100*78+2*78
=7900+156
=7956
追答
25+4*70
=25+280
=305
23*6*7
=23*(6*7)
=23*42
=23*(40+2)
=23*40+23*2
=920+46
=966
70*(49-35)
=70*14
=980
62*14-2*14
=(62-2)*14
=60*14
=840
25*3*4
=25*4*3
=100*3
=300
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