5. Calculaţi:
a) 53-3.42; b) 2.33 -52.2; c) 8+34:9; d) 82-2-32; e) 122 :9-3-4;
) 102-72.2; g) 152 : 25+7°; h) 24+62:9; 1) 28:22–3; j) 20-2-2.
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Răspuns:
a) 53-3×16=53-48=5
b) 2×27-25=54-25=29
c) 8+81:9=8+9=17
d) 64-2×9=64-18=46
e) 144:9-3×4=16-12=4
f) 100-49×2=100-98=2
g) nu știu
h) 24+36:9=24+4=28
i) 28:4-3=7-3=4
j) 20-2×8=20-16=4
Explicație pas cu pas:
4²= 4×4
3³= 3×3×3
5²= 5×5
3⁴= 3×3×3×3
8² =8×8
3²= 3×3
12²= 12×12
10²= 10×10
7²= 7×7
15²= 15×15
7⁰ = nu știu ( am uitat )
6²= 6×6
2²= 2×2
2³= 2×2×2