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58x98怎简便计算

58X98=58x(100-2)=58x100-58x2=5800-116=5684

58X100-58X2=5684

58*100-58*2

原式=59x98+59x2=59x(98+2)=59x100=5900 供参考.

60x90=540090x8=72060x8=4808x8=644500+720+480+64=6664或是 (70-2)(100-2)=7000-200-140+4=6664

12x25=(3x4)x25= 3x(4x25)=3x100=300

55x98=(50+5)x98=50x98+5x98=4900+490=5390

98*37+39=98*(37+2)+2*39-2*98-39=39*100-2*(100-2)-40+1 =3900-200-40+4+1 =3665

88x98=88x(100-2)=88x100-88x2=8800-176=8624

=98*(1001)=98*10098*1=980098=9702

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