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2022-07-01 21:21:40
a)xét tam giác ADB và tam giác AEC
chung A
E=D=90
=>ADB đồng dạng vs aAEC(gg)
=>AE.AB=AD.AC
b)xét 2 tam giác có
AE/AC=AD/AB
chung A
=>ABE đồng dạng với ACB
kb ko bn
2022-04-13 22:07:37