Tính hợp lí
a) (27.45+27.55):(2+4+6+...+14+16+18)
b) (27.700-24.45.20):(45-40+35-30+25-20+15-10+5)
Những câu hỏi liên quan
thực hiện phép tính sau bằng cách hợp lí nhất:
a)(44.52.60):(11.13.15)
b)(168.168-168.58):110
c)(16.17-5):(16.16+11)
d)(27.45+27.55):(2+4+6+...+14+16+18)
e)(27.700-24.45.20):(45-40+35-30+25-20-10+5)
f)1+6+11+16+..=46+51
tính hợp lí
a) 341.67+341.16+659.83
b)42.53+47.156-47.114
c) (44.52.60) / (11.13.15)
d) (168.168-168.58)/110
e) (16.17-5)/ (16.16+11)
f) (27.45+27.55)/(2+4+6+...+14+16+18)
g)(27.700-24.45.20)/(45-40+35-30+25-20+15-10+5)
h)1+6+11+16+...+46+51
\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}\)
\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}\)
\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}\)
\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}\)
\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}=\frac{27.100}{\frac{\left(2+18\right).9}{2}}=30\)
\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}=\frac{26\left(108-12\right)}{\left(32-28\right).4}=\frac{26.96}{4.4}=156\)
\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}=\frac{270.450+270.550}{\frac{\left(2+8\right).9}{2}}\)
\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}=\frac{48.700-48.450}{5.5}\)\(=\frac{48\left(700-450\right)}{25}=\frac{48.250}{25}=480\)
#ĐinhBa
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Thực hiện phép tính bằng cách hợp lí:
a) \(\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}\)
b) \(\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}\)
a) \(\frac{27.4500+135.550.2}{2+4+6+...+18}=\frac{270.450+270.550}{9.20:2}=\frac{270.1000}{90}=3000\)
b) \(\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}=\frac{48.700-48.450}{25}=\frac{48.250}{25}=480\)
(27.700 - 24.25.20):(45-40+35-30+25-20+15-10+5)
bn có thể ns cách làm ko (tính nhanh)
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tính nhanh
48.700-24.45.20 phần 45-40+35-30+25-20+15-10+5.
Q=48.700-24.45.20 phần 45-40+35-30+25-20+15-10+5. Tính Q
(27.700 - 24.25.20):(45-40+35-30+25-20+15-10+5)
Tinh nhanh
Tính nhanh :
\(\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}\)