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37^2 + 74+1
37.37 + 37.2 + 1
37(37+2) + 1
37(40-1) +1
37.40 - 37 + 1
1480 - 36 = 1444
b.
58^2 + 232 + 4
58.58 + 58.4 + 4
58(58+4) + 4
58(60+2) + 4
58.60 + 58.2 + 4
3480 + 116 + 4
3480 + 120 = 3600
c.
27^2 - 100 + 4
27^2 - 81 -15
27.27 - 27.3 - 15
27(27-3) - 15
24(30-3) - 15
24.30 - 24.3 - 15
720-72-15 = 633