Toán Lớp 9: V16b +2V40b – 3V90b với B lớn hơn hoặc bằng 0
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Toán Lớp 9: V16b +2V40b – 3V90b với B lớn hơn hoặc bằng 0
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\sqrt {16b} + 2\sqrt {40b} – 3\sqrt {90b} \left( {b \ge 0} \right)\\
= 4\sqrt b + 2.2\sqrt {10b} – 3.3\sqrt {10b} \\
= 4\sqrt b + \left( {4 – 9} \right)\sqrt {10b} \\
= 4\sqrt b – 5\sqrt {10b}
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