Toán Lớp 6: 1. Tính nhanh
a) 127+39+73; b) 135+360+65+40;
c) 417-17-299; d) 981-718+29.
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Toán Lớp 6: 1. Tính nhanh
a) 127+39+73; b) 135+360+65+40;
c) 417-17-299; d) 981-718+29.
Comments ( 2 )
a){\rm{ }}127 + 39 + 73\\
= (127 + 73) + 39\\
= 200 + 39\\
= 239\\
b){\rm{ }}135 + 360 + 65 + 40\\
= (135 + 65) + (360 + 40)\\
= 200 + 400\\
= 600\\
c){\rm{ }}417 – 17 – 299\\
= (417 – 17) – 299\\
= 400 – 299\\
= 101\\
d){\rm{ }}981 – 718 + 29\\
= (981 + 29) – 718\\
= 1000 – 718\\
= 282
\end{array}\]