(48 8)x125 32x38 38x62简便算法

(48 + 8)x125
=6x8x125+8x125
=6000+1000
=7000
32x38
=32x(40-2)
=32x40-32x2
=1280-64
=1216
38x62
=38x(60+2)
=2280+76
=2356

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