Question

(a) S = −11 − 12 − 13 + 91 + 92 + 93
(b) S = −111 + 223 − (123 − 111)
(c) S = (127 − 263) − (27 − 153)
(d) S = (−2)⁴.289 − 16.189
(e) S = −56.43 + (−56).25 − 56.32
(f) S = −2.(77 − 20) + 77(2 − 20)
(g) S = −11(200 + 31) − 31(−11 − 100)

Answer 1

a)\(S=\left(-11+91\right)+\left(92-12\right)+\left(93-13\right)\\ S=80+80+80=240\)

 

Answer 2

\(\)b)\(S=-111+223-123+111\\ S=\left(-111+111\right)+\left(223-123\right)\\ S=0+100=100\)

Answer 3

c)\(S=127-263-27+153\\ S=\left(127-27\right)-\left(263-153\right)\\ S=100-110=-10\)

Answer 4

= 100

Answer 5

ỦA