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Toán Lớp 7: 1) tính a) -4/6 + 15/-20 ; b) -3/7 : 15/-28 ; c) 2/3 + 4/3 . ( – 9/12 ) 2) tìm x a) 2/5 – x = 2/3 ; b) 1/4 : x = 2/5

Home/ Toán Lớp 7: 1) tính a) -4/6 + 15/-20 ; b) -3/7 : 15/-28 ; c) 2/3 + 4/3 . ( – 9/12 ) 2) tìm x a) 2/5 – x = 2/3 ; b) 1/4 : x = 2/5

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