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86x98用简便方法计算

86x98十172用简便方法计算解:根据提取公因式的简便方法,原式=86x98+86x2=86x(98+2)=86x100=8600

74*98用简便方法计算74*98=74*(100-2)=74*100-74*2=7252

176-98=176-(100-2)=176-100+2=76+2=78

86+86X99=86*(1+99)=86*100=8600

86*98=86*(100-2)=86*100-86*2=8600-172=8428回答完毕~~有疑问请追问,无疑问请点击【采纳】~祝学习进步~~~\(^o^)/~

45*98=45*(100-2)=45*100-45*2=4500-90=4410

86x99+86 =86x(99+1) =86x100 =8600

3.86x99 =3.86x(100-1) =3.86x100-3.86 =386-3.86 =382.14

7.2x98=7.2*(100-2)=720-14.4=705.6

7.8*98=7.8*(100-2)=7.8*100-7.8*2=780-15.6=764.4你好,本题已解答如满意,请点采纳

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