Toán Lớp 6: Tính nhanh:
a, (-199) + (-200) + (-210)
b, -274 – (892 – 700) + (-426 + 892)
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Toán Lớp 6: Tính nhanh:
a, (-199) + (-200) + (-210)
b, -274 – (892 – 700) + (-426 + 892)
Comments ( 2 )
a, (-199) + (-200) + (-210)
= ( -200 + -210 ) + -199
= – 410 + -199
= – 609
b, -274 – (892 – 700) + (-426 + 892)
= ( – 274 + – 426 ) + 892 – 700 + 892
= – 700 + ( 892 – 892 ) +700
= 700 + 0 + 700
= 1400
nêu sai thông cảm nha rối não quá đang thi nữa 🙂
a. (-199) + (-200) + (-210)
= (–199) + (–201) + (–200)
= – (199 + 201) + (–200)
= – 400 + (–200)
= –(400 + 200)
= –600
b. -274 – (892 – 700) + (-426 + 892)
= – 274 – 892 + 700 – 426 + 892
= (-274 – 426) + (-829 + 829) + 700
= -700 + 0 + 700
= -700 + 700
= 0