Question

[Nguyen Dieu Linh]

a) 27*45+27*55/2+4+6+...+16+18         b)26*108-26*12/32-28+24-20+16-12+8-4              c)48*700-24*45*20/45-40+35-30+25-20+15-10 

Answer 1

[Nguyễn Thị Khánh Linh]

\(\frac{48x700-24x45x20}{45-40+35-30+25-20+15-10}\)

\(=\frac{24x2x700-24x45x20}{5+5+5+5}\)

\(=\frac{24x1400-24x900}{20}\)

\(=\frac{24x\left(1400-900\right)}{20}\)

\(=\frac{24x500}{20}\)

\(=\frac{12000}{20}\)

\(=600\)

k nha

 

Answer 2

[Nguyễn Thị Khánh Linh]

\(\frac{27x45+27x55}{2+4+6+...+16+18}\)

\(=\frac{27x\left(45+55\right)}{2+4+6+...+16+18}\)

\(=\frac{27x100}{2+4+6+...+16+18}\)

\(=\frac{2700}{\left(2+18\right)x9:2}\)

\(=\frac{2700}{90}\)

\(=30\)

k nha