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217. Արտադրյալը գրե՛ք կատարյալ տեսքով.
ա) b2 ⋅ b5 ⋅ b2 = b9
գ) xxy ⋅ yzz ⋅ zxx = x2y ⋅ yz2 ⋅ zx2
բ) a1 ⋅ a2 ⋅ a3 ⋅ a4 ⋅ a5 = a15
դ) 4s2 ⋅ ( − 5)ts ⋅ r2t2s = -20s2r2t3
218. Աստղանիշը փոխարինե՛ք միանդամով, որպեսզի ստացվի նույնություն.
ա) 5x2y ⋅ * = 12x3y3
բ) −3a3b2 ⋅ * = 15a7b2c3
–4a
219. Հաշվե՛ք հարմար եղանակով.
ա) 36 − 720 = 729 — 720 = 9
բ) 73 − 5 ⋅ 49 = 343 — 5 x 49 = 16807 — 5 = 16802
գ) 150 ⋅ 7 − 122 ⋅ 7 = 150 ⋅ 7 − 144 ⋅ 7 = 1050 — 1008 = 48
դ) 64 − 3 ⋅ 25 = 64 — 3 ⋅ 32 = 32 x 3 = 96