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51x49一720 48简便运算

原式 =51x51+51x48+51x1 =51x(51+48+1) =51x(99+1) =51x100 =5100 供参考.

原式=2*49*51=2*(50^2-1^2)=2*(2500-1)=4998 再看看别人怎么说的.

60x49+51x68=60x49 +51x60+51x8 =60x(49+51)+408 =60x100+408 =6000+408 =6408.

72x49+51x72=72x(49+51)=72x100=7200

第一个(50-1)*(50+1)平方差公式后面的是两个式子还是一个?

48x48/49=(49-1)x48/49=49x48/49-1x48/49=48-48/49=47又1/49

49x48十49x53一49=49x(48十53一1)=49x100=4900

48x23+48x26+51x48=48*(23+26+51)=48*100=4800 你好,本题已解答,如果满意,请点右上角“采纳答案”,支持一下.

720-49+720+49=720+720-(49-49)=720+720=720x2=1440

48*(49+1)=48*50=2400 .呵呵!

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