121/2×(2/5)
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发布时间:2022-05-30 23:10
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时间:2024-11-30 00:18
(1)-√3×2/√3+2√2(√2-3)
=-2+4-6√2
=2-6√2
(2)√(-2/5)^2-3√-8+√1-(-4/5)^2
=2/5+2+3/5
=1+2
=3
后两题求出x的值
(3)(x+1)^2=121/49
x+1=11/7或x+1=-11/7
x=4/7或x=-18/7
(4)1/2(2x-1)^3=-4
(2x-1)³=-8
2x-1=-2
2x=-1
x=-1/2