bài 2
a/ = 126 + 5=131
b/ = 785-471 :3 +2784=785-157 +2784=3412
c/ = \(703-140:70-17^{6+9-13}=703-2-7^2\)
\(=703-2-49=652\)
d/ \(=135.9-9.130=\left(135-130\right).9=5.9=45\)
Bài 1:
a) 15. 22 = 60
b) 53. 2 - 100 : 4 = 205
c) 20 : 22 + 59 : 58 = 10
d) 84 : 4 + 50 = 22
e) 2021 - 2022 = -1
f) 295 - [245 - (195 - 245)] = 0
\(Bài1:\)
\(a)15.2^2\)
\(=15.4=60\)
\(b)5^3.2-100:4\)
\(=250-100:4\)
\(=250-25\)
\(=225\)
\(c)20:2^2+5^9:5^8\)
\(=5+5^9:5^8\)
\(=5+5^1\)
\(=10\)
\(d)84:4+5^0\)
\(=21+5^0\)
\(=21\)
\(e)2021-2022\)
\(=-1\)
\(f)295-\left[245-\left(195-245\right)\right]\)
\(=295-\left[245-\left(-50\right)\right]\)
\(=295-295\)
\(=0\)
\(h)5^{19}:5^{17}\)
\(=5^{19-17}=5^2=25\)
\(i)151-2^{91}:2^{88}\)
\(=151-2^3\)
\(=143\)
\(j)2^{38}:2^{36}+5.3^2-7^2\)
\(=2^2+5.3^2-7^2\)
\(=2^2+45-7^2\)
\(=49-7^2\)
\(=0\)
\(k)4.15-6^{20}:6^{18}\)
\(=60-6^{20}:6^{18}\)
\(=60-6^2\)
\(=24\)
\(l)\left(-15\right)+27-\left(-27\right)\)
\(=12-\left(-27\right)\)
\(=39\)
\(m)150-\left(12+15\right)-\left(12+150\right)\)
\(=150-27-\left(12+150\right)\)
\(=150-27-162\)
\(=123-162\)
\(=-39\)
\(Bài2:\)
\(a)18.7+65:13\)
\(=126+65:13\)
\(=126+5\)
\(=131\)
\(b)785-\left(323+148\right):3+2784\)
\(=785-471:3+2784\)
\(=785-157+2784\)
\(=628+2784\)
\(=3412\)
\(c)703-140:\left(42+28\right)-17^6.17^9:17^{13}\)
\(=703-140:70-17^{15}:17^{13}\)
\(=703-2-17^2\)
\(=701-289\)
\(=412\)
\(d)135.3^2-3^2.130\)
\(=1215-3^2.130\)
\(=1215-1170\)
\(=45\)