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2010-02-09T16:29:29+01:00
A)28(17-15)=28*2=56
b)135(134-133)=135*1=135
c)31(15-2*7)=31*1=31
d)13(12-6*2)=13*0=0
e)13(49-2*27)=13(49-54)=13*(-5)=-65
f)57(57-55)=57*2=114
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2010-02-09T16:32:47+01:00
A) 28*17 - 28*15 = 28*(17 - 15) = 28*2 = 56

b)134*135 - 133*135 = 135*(134 - 133) = 135*1 = 135

c)31*15 - 62*7 = 31*15 - 31*2*7 = 31*15 - 31*14 = 31*(15 - 14) = 31*1 = 31

d)12*13 - 6*26 = 12*13 - 6*2*13 = 12*13 - 12*13 = 0

e)13*49 - 26*27 = 13*49 - 13*2*27 = 13*49 - 13*54 = 13*(49 - 54) = 13*(-5) = - 65

f) 57² - 57*55 = 57*57 - 57*55 = 57*(57 - 55) = 57*2 = 114
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