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第一题写错了
3*48-2*48
=(3-2)*48
=48
(80-8)*25
=80*25-8*25
=2000-200
=1800
(40-4)*25
=40*25-4*25
=1000-100
=900
88*125
=(80+8)*125
=80*125+8*125
=10000+1000
=11000
50*(20-3)
=50*20-50*3
=1000-150
=850
12*8-12*5
=12*(8-5)
=12*3
=36
(40+4)*25
=40*25+4*25
=1000+100
=1100
望采纳,谢谢
3*48-2*48
=(3-2)*48
=48
(80-8)*25
=80*25-8*25
=2000-200
=1800
(40-4)*25
=40*25-4*25
=1000-100
=900
88*125
=(80+8)*125
=80*125+8*125
=10000+1000
=11000
50*(20-3)
=50*20-50*3
=1000-150
=850
12*8-12*5
=12*(8-5)
=12*3
=36
(40+4)*25
=40*25+4*25
=1000+100
=1100
望采纳,谢谢
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