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  • 1 # 使用者1188538886419

    92+99 197+102 354-108


    =92+(100-1) =197+(100+2) =354-(100+8)


    =92+100-1 =197+100+2 =354-100-8


    =191 =299 =246


    405-99 127-98 323+189-123


    =405-(100-1) =127-(100-2) =323-123+189


    = 405-100+1 =127-100+2 =389


    =306 =29


    545-167-145 478-47-178 344-(144+37)


    =545-145-167 =478-178-47 =344-144-37


    =233 =253 =163


    236-(177+36) 400-256-44 517-53-47


    =236-36-177 =400-(256+44) =517-(53+47)


    =23 =100 =417


    248+86-48 672-36+64 (6467-832)+(1832-1467)


    =248-48+86 =672-(36+64) =6467-1467+(1832-832)


    = 286 =572 =6000


    1530+(592-530)-192 (2+4+6+……+98+100)-(1+3+5+……+97+99)


    =1530-530+(592-192) =(2-1)+(4-3)+…+(98-97)+(100-99)


    =1400 =1+1+...+1+1 =50


    25×9×4 45×4×5 23 ×5×2


    =25×4×9 =45×(4×5) =23×(5×2)


    =900 =90 =230


    8×(125×13) (250×125)×(4×8)


    =8×125×13 =125×8×(250×4)


    =13000 =1000000


    42×125×8×5 25×4×88×125


    =125×8×(42×5) =100×11×(8×125)


    =210000 =1100000


    72×125 125×64×25 42×125×8×5


    =8×125×9 =125×8×(25×8) =42×5×(125×8)


    =9000 =200000 = 210000


    25×4×88×125 88×125


    =100×(8×125) ×11 =8×125×11


    =100×1000×11 =1000×11


    =100000×11 =11000


    =1100000

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