(12x34x26x12)x(12十26)用简便方法计算
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原式=(12x12x2x2)x(17x13)x38
=(3x3)x(2x2x2x2x2x2)x221x38
=9x221x2x(32x38)
=9x221x2x1216
=1989x1216x2
=(2000-11)x2432
=2000x2432-11x2432
=4864000-(10+1)x2432
=4864000-24320-2432
=4864000-26752
=4837248
=(3x3)x(2x2x2x2x2x2)x221x38
=9x221x2x(32x38)
=9x221x2x1216
=1989x1216x2
=(2000-11)x2432
=2000x2432-11x2432
=4864000-(10+1)x2432
=4864000-24320-2432
=4864000-26752
=4837248
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