26.108-26.12/32-28+24-20+16-12+8-4=2496/16

\(\frac{2496}{16}\)

Xét tử số (a)

27.4500+135.550.2

=(27.5).(4500:5)+135.(550.2)

=135.900+135.1100

=135.(900+1100)

=135.2000

=270000

Xét mẫu số(b)

2+4+6+8+...+16+18

Khoảng cách : 4-2=2

Số số hạng : (18-2):2+1=9(số)

Tổng:(18+2).9:2=90

\(\Rightarrow\frac{a}{b}=\frac{270000}{90}=30000\)

=> B = 30000

= 2881/45                tick nha

dễ quá

k rồi mình trả lờ cho

bạn link địa chỉ này https://olm.vn/hoi-dap/question/183785.html nhé !

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Tính nhanh mà bạn

\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}=\frac{27.100}{\frac{\left(2+18\right).9}{2}}=30\)

\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}=\frac{26\left(108-12\right)}{\left(32-28\right).4}=\frac{26.96}{4.4}=156\)

\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}=\frac{270.450+270.550}{\frac{\left(2+8\right).9}{2}}\)

\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}=\frac{48.700-48.450}{5.5}\)\(=\frac{48\left(700-450\right)}{25}=\frac{48.250}{25}=480\)

#ĐinhBa

\(\frac{27.4500+135.550.2}{2+4+6+...+18}\)

\(=\frac{27.10.450+135.2.550}{\left(2+18\right).9:2}\)

\(=\frac{270.450+270.550}{20.9:2}\)

\(=\frac{270.\left(450+550\right)}{9.20:2}\)

\(=\frac{27.10.1000}{9.10}\)

\(=\frac{3.1000}{1}=3000\)