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28x125的简便方法计算

28x125-2x125-6x125=(28-2-6)x125=20x125=2500

16x(125x34+88x125)=2*8*125*(34+88)…………变一变就简便=(8*125)*(2*122)=1000*244=244000

=125*8*28*3=1000*84=84000

56X125=7x8x125=7x(8x125)=7x1000=7000

72x25+28x125=72x25+28x(25+100)=72x25+28x25+28x100=(72+28)x25+2800=100x25+2800=2500+2800=5300

原式=11x8x125=11x1000=11000 或者:=(80+8)x125=80x125+8x125=10000+1000=11000

=28x2x4+125x4=56x4+125x4=(56+125)X4=181X4=724

28*121-28*21 =28*(121-21) =28*100 =2800 95*101 =95*(100+1) =95*100+95*1 =9500+95 =9595 125*72 =(125*8)*9 =1000*9 =9000 你好,本题已解答,如果满意,请点右上角“采纳答案”,支持一下.

98x125=(100-2)x125=125x100-2x125=12250

88x125=(80+8)*125=80*125+8*125=10000+1000=11000

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