Toán Lớp 2: 1+8+2+3+4+5+6+7+9=??????????????????????????????????????????????????
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Toán Lớp 2: 1+8+2+3+4+5+6+7+9=??????????????????????????????????????????????????
Comments ( 2 )
Giải đáp:
Lời giải và giải thích chi tiết:
1+8+2+3+4+5+6+7+9
=(1+9)+(8+2)+(3+7)+(4+6)+5
=10+10+10+10+5
=10xx4+5
=40+5
=45
1 + 8 + 2 + 3 + 4 + 5 + 6 + 7 + 9
= ( 1+9 ) +( 8+2 ) + ( 3+7) + ( 4+6 ) + 5
= 10 + 10 + 10 + 10 + 5
= 45