calculati:
(89+11)÷(99-89)÷(28÷7×3÷6+8)×(5×8÷10÷2)×5=
(63-7×7+16)÷(2×4×9-6×6-26)× 100×10-2090=
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(89+11)÷(99-89)÷(28÷7×3÷6+8)×(5×8÷10÷2)×5 =
= 100:10:10×2×5=
= 10:10×10 =
= 1×10
= 10
(63-7×7+16)÷(2×4×9-6×6-26)×100×10-2090 =
= (63-49+16):(72-36-26)×1000-2090=
= 30:10×1000-2090 =
= 3000-2090 =
= 910
= 100:10:10×2×5=
= 10:10×10 =
= 1×10
= 10
(63-7×7+16)÷(2×4×9-6×6-26)×100×10-2090 =
= (63-49+16):(72-36-26)×1000-2090=
= 30:10×1000-2090 =
= 3000-2090 =
= 910
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