简便计算怎么做,急啊
1个回答
2016-04-10
展开全部
32x92-32+32x9
=32x(92-1+9)
=32x100
=3200
49+7x33
=7x(7+33)
=7x40
=280
81+9x191
=9x(9+191)
=9x200
=1800
50x125
=25x2x125
=25x250
=6250
=32x(92-1+9)
=32x100
=3200
49+7x33
=7x(7+33)
=7x40
=280
81+9x191
=9x(9+191)
=9x200
=1800
50x125
=25x2x125
=25x250
=6250
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