Tính :
1, ( 75.68 + 75.53 ) : 121
2, ( 47.69 + 47.75 ) : 141 + 53
3, ( 77.21 - 21.34 + 21.72 ) : 151 - 15
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a. -15 . 999
=-14985
b. 121. (-63) +63 .(-53) -63.26
=-7623+(-3339)-1638
=-10962-1638
=-12600
c. [299. (-74) + (-299) . (-24)] : (-50).
=[-22126+7176]:(-50)
=-14950:(-50)
=299
d. [900 + (-1140) + 720 ] : (-120)
=[-240+720]:(-120)
=480:(-120)
=-4
e. 6. (-4 2 ). (-102 ) : 24
=-252.(-102):24
=25704:24
=1071
f. [(-8).(-8).(-8).(-8) + 84 ] : 8100
=[64.(-8).(-8)+84]:8100
=[-512.(-8)+84]:8100
=[4096+84]:8100
=4180:8100
=0,51
Gọi C=\(\frac{\frac{2}{39}-\frac{1}{15}-\frac{2}{153}}{\frac{1}{34}+\frac{3}{20}-\frac{3}{26}}:\frac{1+\frac{2}{71}-\frac{5}{121}}{\frac{65}{121}-\frac{26}{71}-13}\)
=\(\frac{\frac{-4}{9}\cdot\left(\frac{1}{34}+\frac{3}{20}-\frac{3}{26}\right)}{-\left(\frac{1}{34}-\frac{3}{20}-\frac{3}{26}\right)}:\frac{1+\frac{2}{71}-\frac{5}{121}}{-13\cdot\left(\frac{2}{71}-\frac{5}{121}+1\right)}\)
=\(-\frac{4}{9}:-\frac{1}{13}=-\frac{4}{9}\cdot\left(-13\right)=\frac{\left(-4\right)\cdot\left(-13\right)}{9}=\frac{52}{9}\)
\(a.\)
\(\left(75.68+75.53\right):121\)
\(=\left[75\left(68+53\right):121\right]\)
\(=75.121:121\)
\(=75\)
\(b.\)
\(\left(47.69+47.75\right):141+53\)
\(=\left\{\left[47\left(69+75\right)\right]:141+53\right\}\)
\(=47.144:141+53\)
\(=48+53\)
\(=101\)
\(c.\)
\(\left(77.21-21.34+21.72\right):151-15\)
\(=21\left(77-34+72\right):151-15\)
\(=21.115:151-15\)
\(=\dfrac{2415}{151}-15\)
\(=\dfrac{150}{151}\)
1) \(\left(75.68+75.53\right):121\)
\(=\left[75\left(68+53\right)\right]:121\)
\(=\left(75.121\right):121\)
\(=75\)
2) \(\left(47.69+47.75\right):141+53\)
\(=\left[47\left(69+75\right)\right]:141+53\)
\(=\left(47.144\right):141+53\)
\(=6768:141+53\)
\(=47+53\)
\(=100\)
3) \(\left(77.21-21.34+21.72\right):151-15\)
\(=\left[21\left(77-34+72\right)\right]:151-15\)
\(=\left(21.115\right):151-15\)
\(=2415:151-15\)
\(\approx1\)