Câu hỏi của Nguyễn Thị Lan Anh

Question

Tính hợp lí ( nếu có thể ):a) (-83) + 302 + 83b) 14 . (-7) - 216 : 2c) 56 . (-32) + (-68) . 56d) 23 - 6 . [ 25 - ( 33 - 28 ) 2 ] e) 15 . (-6) - 420 : (-4)f) 63 . (-52) + (-48) . 63

chuche · Accepted Answer

$a.\left(-83\right)+302+83\
=\left(-83+83\right)+302\
=0+302\
=302\
b.14.\left(-7\right)-216:2\
=-98-108\
=-206\
c.56.\left(-32\right)+\left(-68\right).56\
=56.\left[\left(-32\right)+\left(-68\right)\right]\
=57.\left(-100\right)\
=-5700\
d.2^3-6.\left[25-\left(33-28\right)^2\right]\
=8-6\left[25-5^2\right]\
=8-6\left[25-25\right]\
=8-6.0\
=8-0\
=8\
e.15.\left(-6\right)-420:\left(-4\right)\
=-90-\left(-105\right)\
=-90+105\
=15$$f.63.\left(-52\right)+\left(-48\right).63\
=63.\left[\left(-52\right)+\left(-48\right)\right]\
=63.\left(-100\right)\
=-6300$Câu trả lời: $a.\left(-83\right)+302+83\
=\left(-83+83\right)+302\
=0+302\
=302\
b.14.\left(-7\right)-216:2\
=-98-108\
=-206\
c.56.\left(-32\right)+\left(-68\right).56\
=56.\left[\left(-32\right)+\left(-68\right)\right]\
=57.\left(-100\right)\
=-5700\
d.2^3-6.\left[25-\left(33-28\right)^2\right]\
=8-6\left[25-5^2\right]\
=8-6\left[25-25\right]\
=8-6.0\
=8-0\
=8\
e.15.\left(-6\right)-420:\left(-4\right)\
=-90-\left(-105\right)\
=-90+105\
=15$$f.63.\left(-52\right)+\left(-48\right).63\
=63.\left[\left(-52\right)+\left(-48\right)\right]\
=63.\left(-100\right)\
=-6300$

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