Oblicz :
a) 3 x 7 - 4 x 5 =
b) 6 x (2+7) =
c) 10 x 6 + 12 : 3 =
d) 100 - 2 x (13 - 7 )
e) 70 - ( 25 - 4 ) : 7
f) 10 x 6 + 12 : 3 + 1 =
g) 5 x ( 4 + 7 ) - 6 x 3 =
h) 8 x 9 - ( 5 x 4 - 2 x 7 ) - 2 =
i) 2 x 9 : 3 + 12 x ( 17 - 4 x 3 ) =
j) 2 x 70 - ( 3 x 5 + 14 ) x 2 - 10 =
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b) 6 x (2+7) =6x9=54
c) 10 x 6 + 12 : 3 =60+4=64
d) 100 - 2 x (13 - 7 )=100-2x4=100-8=92
e) 70 - ( 25 - 4 ) : 7=70-21:7=70-3=67
f) 10 x 6 + 12 : 3 + 1 =60+4+1=65
g) 5 x ( 4 + 7 ) - 6 x 3 =5x11-18=55-18=37
h) 8 x 9 - ( 5 x 4 - 2 x 7 ) - 2 =8x9-20-14=72-20-14=38
i) 2 x 9 : 3 + 12 x ( 17 - 4 x 3 ) =18:3+12x(17-12)=6+12x5=6+60=66
j) 2 x 70 - ( 3 x 5 + 14 ) x 2 - 10 =140-29x2-10=140-58-10=72