Toán Lớp 6: 3×4×(-5)×(-6)-7×8×(-9)×10
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Toán Lớp 6: 3×4×(-5)×(-6)-7×8×(-9)×10
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Comments ( 2 )
3×4×(-5)×(-6)-7×8×(-9)×10
=[(-5)xx(-6)xx3]xx4-7xx8xx[(-9)xx10]
=90xx4-56xx(-90)
=90xx4+56xx90
=90xx60
=5400
3 xx 4 xx (-5) xx (-6) – 7 xx 8 xx (-9) xx (10)
= [(-5) xx (-6) xx 3]xx 4 – 7 xx 8 xx [(-9) xx 10]
= 90 xx 4 – 56 xx (-90)
= 90 xx 4 – (-56) xx 90
= 90 xx [4 – (-56)]
= 90 xx 60
= 5400
#dtkc