Toán Lớp 6: Tính nhanh
-8/3 × 5/7 – 5/7 ×1/3
5/7 ×1/3
b. 1/3×5/2+ -1/3 ×7/2 -4/3
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Toán Lớp 6: Tính nhanh
-8/3 × 5/7 – 5/7 ×1/3
5/7 ×1/3
b. 1/3×5/2+ -1/3 ×7/2 -4/3
Comments ( 2 )
Giải đáp+Lời giải và giải thích chi tiết:
a. {-8}/3×5/7-5/7×1/3
=5/7×({-8}/3-1/3}
=5/7×({-8-1}/3)
=5/7×{-9}/3
=5/7×(-3)
={-15}/7
b. 1/3×5/2+({-1}/3)×7/2-4/3
=1/3×5/2+({-1}/3)×7/2-1/3×4
=1/3×(5/2-7/2-4)
=1/3×({5-7-8}/2)
=1/3×({-10}/2)
=1/3×(-5)
={-5}/3
———————————————-
@Changg_Aquatic World
a) -8/3 . 5/7 – 5/7 . 1/3
= (-8/3 – 1/3) . 5/7
= -3 . 5/7
= -15/7
b) 1/3 . 5/2 + -1/3 . 7/2 – 4/3
= 1/3 . 5/2 + 1/3 . -7/2 – 4/3
= 1/3 . (5/2 + -7/2) – 4/3
= 1/3 . -1 – 4/3
= -1/3 – 4/3
= -5/3