Tìm A=(900-1^2)x(900-2^2)x(900-3^2)x...x(900-70^2)
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a) 20 x 40 = 800 70 x 60 = 4 200 400 x 20 = 8 000 900 x 30 = 27 000
b) 900 : 30 =30 240: 80 = 3 3 600 : 600 =6 28 000 : 400=70
a) (370 + 12) : 2 = 382 : 2
= 191
370 + 12 : 2 = 370 + 6
= 376
b) (231 – 100) x 2 = 131 x 2
= 262
231 – 100 x 2 = 231 – 200
= 31
c) 14 x 6 : 2 = 84 : 2
= 42
14 x (6 : 2) = 14 x 3
= 42
d) 900 – 200 – 100 = 700 – 100
= 600
900 – (200 – 100) = 900 – 100
= 800
\(A=\left(900-1^2\right)\left(900-2^2\right).....\left(900-70^2\right)\\ =\left(900-1^2\right)....\left(900-30^2\right).....\left(900-70^2\right)\\ =\left(900-1^2\right).....0....\left(900-70^2\right)=0\)
\(a=\left(900-1^2\right)\left(900-2^2\right)\left(900-3^2\right)...\left(900-70^2\right)\)
\(a=\left(900-1^2\right)\left(900-2^2\right)\left(900-3^2\right)....\left(900-30^2\right)....\left(900-70^2\right)\)
\(a=\left(900-1^2\right)\left(900-2^2\right)\left(900-3^2\right)....0....\left(900-70^2\right)\)
\(a=0\)
a) 172 + 10 x 2 = 170 +20 = 192
b) 10 x 2 + 300 = 20 + 300 = 320
c) 69 – 54 : 6 = 69 – 9 = 60
d) 900 + 9 x 10 = 900 +90 = 990
e) 20 x 6 + 70 = 120 + 70 = 190
f) 72 + 300 x 3 = 72 + 900 = 972