rút gọn: 1978.1979+1980.2+1958/1980.1970-1978.1979
Rút gọn p/số:1978.1979 1980.21 1958/ 1980.1970- 1978.1979
A,tính nhanh \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
B,rút gọn \(\frac{5^2.6^{11}.16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^1}\)
A, =1000
B, =\(\frac{101}{1440}\)
tính nhanh 1978.1979+1988.21+1958/1980.1979-1978.1979
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2.a,tính nhanh:1978.1979+1978.21+1958/1980.1979-1978.1979
a)Tính nhanh: \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
b)Rút gọn: \(\frac{5^2.6^{11}.16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^3}\)
b,\(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
\(b,\frac{1978\cdot1979+1980\cdot21+1958}{1980\cdot1979-1978\cdot1979}\\ =\frac{1978\cdot1979+\left(1979+1\right)\cdot21+1958}{1979\left(1980-1978\right)}\\ =\frac{1978\cdot1979+1979\cdot21+\left(21+1958\right)}{1979\cdot2}\\ =\frac{1978\cdot1979+1979\cdot21+1979}{1979\cdot2}\\ =\frac{1979\left(1978+21+1\right)}{1979\cdot2}\\ =\frac{2000}{2}\\ =1000\)
\(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}=\frac{1978.1979+1979.21+21+1958}{1979\left(1980-1978\right)}=\frac{1979.1978+1979.21+1979}{1979.2}=\frac{1979\left(1978+21+1\right)}{1979.2}=\frac{2000}{2}=1000\)
tính \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
Tính nhanh:
\(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
\(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)