Toán Lớp 6: tính 1 cách hợp lí:
a) $34.(-56)-134.(-56)$
b) $(34-14).(-5)+15.(-14-6)$
c) $135.3^{2}-3^{2}.130$
d) $159.(-37)-(-37).58-(-37)$
e) $(-42).(35-16)-35.(16-42)$
f) $703-140:(42+28)-17^{6}.17^{9}:17^{13}$
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Toán Lớp 6: tính 1 cách hợp lí:
a) $34.(-56)-134.(-56)$
b) $(34-14).(-5)+15.(-14-6)$
c) $135.3^{2}-3^{2}.130$
d) $159.(-37)-(-37).58-(-37)$
e) $(-42).(35-16)-35.(16-42)$
f) $703-140:(42+28)-17^{6}.17^{9}:17^{13}$
Comments ( 1 )
Giải đáp:
a)
34.(-56)-134.(-56)
=(-56).(34-134)
=-56.(-100)
=5600
d)
159.(-37)-(-37).58-(-37)
=159.(-37)-(-37).58-(-37)×1
=-37.(159-58-1)
=-37.100
=-3700
b)
(34-14).(-5)+15.(-14-6)
=34.(-5)-14.(-5)+15.(-14)+15.(-6)
=[34.(-5)+15.(-6)]+[-14.(-5)+15.(-14)]
=(-170-90)+[-14.(-5+15)]
=-260-14.10
=-260-140
=-400
e)
(-42).(35-16)-35.(16-42)
=-42.35-42.(-16)-35.16+9-35.(-42)
=[-42.35-35.(-42)]+[-42.(-16)-35.16]
=(-42.35-35.42)+[-16.(-42+35)]
=0-16.(-7)
=112
c)
135.3^(2)-3^(2).130
=3^(2)(135-130)
=3^(2).5
=9.5
=45
f)
703-140:(42+28)-17^(6).17^(9):17^13
=730-140:70-17^(6+9-13)
=730-2-289
=439