Compute:
90×4−1÷2−49^0 \times 4^{-1} ÷ 2^{-4}90×4−1÷2−4
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90×4−1÷2−4=1×4−1÷2−4 [∵a0=1]=1×2−2÷2−4=1×2−2−(−4)=1×2−2+4=1×22=1×4=49^0 \times 4^{-1} ÷ 2^{-4}\\[1em] = 1 \times 4^{-1} ÷ 2^{-4} \space [∵a^0 = 1] \\[1em] = 1 \times 2^{-2} ÷ 2^{-4}\\[1em] = 1 \times 2^{-2-(-4)}\\[1em] = 1 \times 2^{-2+4}\\[1em] = 1 \times 2^{2}\\[1em] = 1 \times 4\\[1em] = 490×4−1÷2−4=1×4−1÷2−4 [∵a0=1]=1×2−2÷2−4=1×2−2−(−4)=1×2−2+4=1×22=1×4=4
90×4−1÷2−4=49^0 \times 4^{-1} ÷ 2^{-4} = 490×4−1÷2−4=4
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