TRUONG THCS TAN MAIBAI TAP TUAN 8 CUA DOT NGHI DICH COVID-19(Tu 16/3 den 21/3)Bai 1:Thuc hien phep tinh(hop li neu co the)i,45-5.(17+9)-17.(-15)k,14:[(-25)+53]+(-25).[(-4)+53]m,45.(18-15)-18.(45+5)n,120-{22-[40-(15-17)].2.2015^0
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