Question

小学的巧算题啊

1计算3.6×31.4＋43.9×6.4 巧算啊2计算578.47-4.62-78.47-3.38 巧算啊3计算0.9999×1.3-0.1111×2.7 巧算啊4计算7.37×12.5×0.15×16巧算啊5计算（44332-443.32）÷（88664-886.64）巧算啊

Answer 1

5计算：观察得(44332-443.32)是(88664-886.64)的一半，88664-886.64可以提取公因数2，变成(44332-443.32)÷2×(44332-443.32)=0.54计算：把16分为2×8，就可以得到7.37×(12.5×8)×(0.15×2)=7.37×100×2=221.13计算：把2.7分为0.3×9，就可以得到0.999×1.3-0.1111×9×0.3=0.9999×(1.3-0.30)=0.99992计算：可化为(578.47-78.47)-(4.62+3.38)=500-8=4921计算：sorry不会以上的方法仅供参考，可能有更好的答案！

Answer 2

1.3.6×31.4＋43.9×6.4 =3942.578.47-4.62-78.47-3.38 =492.363.0.9999×1.3-0.1111×2.7 =12.698734.7.37×12.5×0.15×16=221.15.（44332-443.32）÷（88664-886.64）0.5

Answer 3

1.原式=3.6×31.4+31.4×6.4+12.5×6.4
=10×31.4+12.5×6.4
=314+80
=394
2.原式=(578.47-78.47)-(4.62+3.38)
=500-8
=492
3.原式=0.9999×1.3-0.9999×0.3
=0.9999×1
=0.9999
4.原式=7.37×(12.5×16)×0.15
=7.37×200×0.15
=7.37×30
=221.1
5.原式=(443.2×99)÷(886.64×99)
=0.5

Answer 4

394 492.36 221.1 0.5