Toán Lớp 6: 369-(206-15)-(-206+369). Tính nhanh
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Toán Lớp 6: 369-(206-15)-(-206+369). Tính nhanh
Comments ( 2 )
369-(206-15)-(-206+369)
=369-206+15+206-369
=(369-369)+(-206+206)+15
= 0 + 0 +15
=15
369 – ( 206 – 15 ) – ( -206 + 369 )
= 369 – 206 + 15 + 206 – 369
= ( 369 – 369 ) + ( -206 + 206 ) + 15
= 0 + 0 + 15
= 15