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49乘99减51的简便运算

原式 =49x99-51 =49x(100-1)-51 =49x100-49x1-51 =4

94+49+51 =94+(49+51) =94+100 =194

5199一51 =51x(99-1) =51x98 =51x(100-2) =51x100

49×49+49×51的简便算式 49×49+49×51 =49*(49+51) =49*10

49×51-2499 =(50-1)×(50+1)-2499 =50×50-1×1-2499

152×49+51×152=152×(49+51)=152×100=15200, 24×25=6×

(50-1)²+(50+1)²=2(50²+1

要是题目没错的话,而且你学过平方差公式,可以这样做 49×51+51×49 =(50-1)×(50+

49×39加39×51 =39x(49+51) =39x100 =3900 请采纳正确答案,

138x51一138 二138X(51一1) 二138Ⅹ50 二690O

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