Toán Lớp 6: Tính nhanh:
a,1 ·2 ·3 ·… ·9-1 ·2 ·3 ·… ·8-1 ·2 ·3 ·… ·7 ·8 ²
b,(3 ·4 ·2^16) ²/11 ·2^13 ·4^11-16^9
d,1152-(374+1152)+(-65+374)
e,13-12+11+10-9+8-7-6+5-4+3+2-1.
Ai nhanh cho 5* và hay nhất nha
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Toán Lớp 6: Tính nhanh:
a,1 ·2 ·3 ·… ·9-1 ·2 ·3 ·… ·8-1 ·2 ·3 ·… ·7 ·8 ²
b,(3 ·4 ·2^16) ²/11 ·2^13 ·4^11-16^9
d,1152-(374+1152)+(-65+374)
e,13-12+11+10-9+8-7-6+5-4+3+2-1.
Ai nhanh cho 5* và hay nhất nha
Comments ( 1 )
Giải đáp:
a,
$\text{1.2.3. … .9 – 1.2.3. … .8 – 1.2.3. … .$8^2$ }$
$\text{= 1.2.3. … .8 . (9 – 1 – 8)}$
$\text{= 1.2.3. … . 8 .0 =0}$
b, $\frac{(3.4. 2^{16})^{2}}{11.2^{13}. 4^{11} – 16^{9}}$
=$\frac{3^{2}.4^{2}. 2^{32}}{11.2^{13}. 2^{22} – 2^{36}}$
= $\frac{(3.4. 2^{16})^{2}}{11.2^{13}. 4^{11} – 16^{9}}$
= $\frac{3^{2}.2^{4}. 2^{32}}{11.2^{35} – 2^{36}}$
=$\frac{3^{2}. 2^{36}}{2^{35}(11-2)}$
=$\frac{3^2. 2^{36}}{2^{35}.9}$
=2
d, $\text{1152 – (374 + 1152) + (-65 + 374)}$
$\text{=1152 – 374 – 1152 – 65 + 374}$
$\text{=-65}$
e, $\text{13-12+11+10-9+8-7-6+5-4+3+2-1}$
$\text{=13 +(-12-1)+(11+2)+(10+3)+(-9-4)+(8+5)+(-7-6)}$
$\text{13-13+13+13-13+13-13}$
$\text{=13}$