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a) 15 cm2 + 20 cm2 = 35 cm2
60 cm2 - 42 cm2 = 18 cm2
20 cm2 + 10 cm2 + 15 cm2 = 45 cm2
b) 12 cm2 x 2 = 24 cm2
40 cm2 : 4 = 10 cm2
50 cm2 - 40 cm2 + 10 cm2 = 20 cm2
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Tính tổng mỗi phương trình, sau đó nhân chúng với 3.
1 + 5 = (1 + 5) x 3 = 6 x 3 = 18
2 + 10 = (2 +10) x 3 = 12 x 3 = 36
3 + 15 = (3 + 15) x 3 = 18 x 3 = 54
Vì thế
4 + 20 = (4 + 20) x 3 = 24 x 3 = 72
Vậy, kết quả là 72
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a) 15 + x - 5 = 20
15 + x = 20 + 5
15 + x = 25
x = 25 - 5
x = 20
b) y x 5 = 10 x 2
y x 5 = 20
y = 20 : 5
y = 4
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có tất cả :2025:5=405 (cặp số)
tổng là :405*(2025+5)=822150
đáp số :822150
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21=231
trả lời:
=231
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10+2=12
20-15=5
K mk nhrs
M.n
10+2 = 12
20-15= 5