《2025年运算升级卡七年级数学上册人教版》

1.$-5×(-\frac {11}{5})+13×(-\frac {11}{5})-3×(-\frac {11}{5})$

答案： $(-\frac{11}{5})× (-5 + 13 - 3)=(-\frac{11}{5})× 5=-11$

2.$10.4×\frac {3}{8}+5.2×\frac {1}{2}+(-\frac {1}{5})×(-\frac {26}{5})$

答案： $5.2× 2× \frac{3}{8}+5.2× \frac{1}{2}+\frac{26}{25}=5.2× (\frac{3}{4}+\frac{1}{2})+\frac{26}{25}=5.2× \frac{5}{4}+\frac{26}{25}=\frac{13}{2}+\frac{26}{25}=\frac{387}{50}$

3.$-|-0.25|×(-5)×4×(-\frac {1}{25})$

答案： $-\frac{1}{4}× (-5)× 4× (-\frac{1}{25})=-(\frac{1}{4}× 4)× (5× \frac{1}{25})=-1× \frac{1}{5}=-\frac{1}{5}$

4.$-3.14×35.2+6.28×(-23.3)-1.57×36.4$

答案： $-1.57× 2× 35.2+1.57× 4× (-23.3)-1.57× 36.4=-1.57× (70.4 + 93.2 + 36.4)=-1.57× 200=-314$

5.$(-1)×(-\frac {4}{5})×\frac {8}{15}×\frac {3}{2}×(-\frac {2}{3})×0×(-1)$

答案： 0