20-20+12-2+2+3-4+2-1-1-1-1-1-1+10000000-2-3-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
2 câu trả lời
Đáp án:
Giải thích các bước giải:
20-20+12-2+2+3-4+2-1-1-1-1-1-1+10000000-2-3-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
20 - 20 hết, -2 +2 hết, +3 -3 hết
= 0+12-4+2-1-1-1-1-1-1+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
=12-4+2-1-1-1-1-1-1+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
+2 - 1 -1 hết
=12-4-1-1-1-1+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
=12+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9-4-1-1-1-1
= 10000012 - ( 2+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+4+1+1+1+1)
= 10000012 - 94
= 9999908
Đá án:
20-20+12-2+2+3-4+2-1-1-1-1-1-1+10000000-2-3-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
20 - 20-2+2+3 -3
= 0+12-4+2-1-1-1-1-1-1+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
=12-4+2-1-1-1-1-1-1+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9+2-1-1
=12-4-1-1-1-1+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9
=12+10000000-2-4-5-6-7-8-9-1-2-3-4-5-6-7-8-9-4-1-1-1-1
=10000012-[2+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+4+1+1+1+1]
= 10000012 - 94
= 9999908
Chúc bạn học tốt!