Bài 2:
a: \(=36\cdot55-55\cdot37+55\cdot11=55\left(36-37+11\right)\)
=55x12=660
b: \(=98\cdot42-50\cdot\left[\left(18-8\right):2+9\right]\)
=98x42-50x14
=3416
c: \(=407-\left[20:4+9\right]:2\)
=407-7
=400
B1
\(a,=785-471:3+2784=785-157+2784\\ =628+2784=3412\)
\(b,=703-140:70-17^{6+9-13}=703-2-17^2\\ =703-2-289=412\)
\(c,=3^2.\left(135-130\right)=9.5=45\)
B2
\(a,=36.55-37.5.11+11.11.5=36.55-37.55+11.55\\ =\left(36-37+11\right).55=10.55\\ =550\)
\(b,=98.42-50\left[\left(18-8\right):2+9\right]=98.42-50\left(10:2+9\right)\\ =98.42-50\left(5+9\right)=98.42-50.14\\ =98.3.14-50.14=294.14-50.14\\ =\left(294-50\right).14=244.14=3416\)
\(c,=407-\left(20:4+9\right):2=407-\left(5+9\right):2=407-14:2\\ =407-7=400\)
\(d,=3.5^2+5^2.4-27.\dfrac{1}{3^2}-18.\dfrac{1}{3^2}\\ =5^2.\left(3+4\right)-\left(27-18\right).\dfrac{1}{3^2}=25.7-9.\dfrac{1}{9}=175-1=174\)
