55×55= 95×95= 71×19= 25×85= 37×33= 74×34=
26×24= 64×66= 47×43= 53×57= 35×99= 25×999=
48×99= 78×999= 91×99= 62×11= 447×11= 235×11=
39×11= 45×11=
分析:橫向數(shù):
(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)依據(jù)整數(shù)乘法計(jì)算方法即可解答,
(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)運(yùn)用乘法分配律解答.
解答:
解:55×55=3025 95×95=9025 71×19=1349 25×85=2125 37×33=1221 74×34=2516
26×24=624 64×66=4224 47×43=2021 53×57=3021 35×99=3465 25×999=24975
48×99=4752 78×999=77922 91×99=9009 62×11=682 447×11=4917 235×11=2585
39×11=429 45×11=495
故答案為:3025,9025,1349,2125,1221,2516,624,4224,2021,3021,3465,24975,4725,77922,9009,682,4917,2585,429,495.
點(diǎn)評(píng):(1)依據(jù)整數(shù)乘法計(jì)算方法正確進(jìn)行計(jì)算,(2)正確運(yùn)用乘法分配律解決問題,是本題考查知識(shí)點(diǎn).
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