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15十15X99怎样巧算

15十15X99 =15×(1+99) =15×100 =1500

把12.15取出来 然后就变成了 12.15(99+1) 答案1215 不就完美了么。

100个

37×99+37 =37×(99+1) =37×100 =3700 125×24 =125×(20+4) =125×20+125×4 =2500+500 =3000 0.26+5.72+4.28+4.74 =(0.26+4.74)+(5.72+4.28) =5+10 =15

15.9十15.9X99 =15.9×(1+99) =15.9×100 =1590

15、9十15、9X99 =15.9×(1+99) =15.9×100 =1590

15x99+5用简便运算 =15×(100-1)+5 =15×100-15+5 =1500-10 =1490

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