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U) -2)(5)Express ás a power of rational number with positive exponent:(c) 59x50 (359) *27 |
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Answer» 7) i) (1/5)^-3=(5)^3=125; ii) (-1/3)^-7=(-3)^7=-2187,; iii) (5)^-4×(5)^4=(5)^4/(5)^4=1; iv) (-2/3)^-5 × (-2//3)^-10= (-2/3)^5 ×(3/-2)^10=(3/2)^2; (v)[(-5/7)^3]-4=[(-125/343)]^-4=(343/-125)^4; vi)(3^-4)÷(9)^2×27; 81/81×27=1×27=27 a) (1/5)^-3=125; b) (-1/3)^-7=(-3)^7=-2187; c)5^4 × 5^-5= 1/5 (1/5)^-3=(5)^3=125, (-1/3)^-7=(-3)^7=-2187 5^4 × 5^-5=5^4-5=5^-1=1/5 |
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