584-484-57 102*79 （40+8）* - 知识问答

584-484-57 102*79 （40+8）*25 61*99+61 101*32 简便运算

1个回答

584-484-57
=100-57
=43
102*79
=（100+2）*79
=7900-158
=7742
（40+8）*25
=48*100/4
=1200
61*99+61
=61(99+1)
=6100
101*32
=(100+1)*32
=3200+32
=3232 .

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