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Bài 1:
a) 9086 - X x 9 = 3947
X x 9 = 9086 - 3947
X x 9 = 5139
X = 5139 : 9
X = 571
b) (X - 4350) : 705 = 8682
X - 4350 = 8682 x 705
X - 4350 = 6120810
X = 6120810 + 4350
X = 6125160
Bài 2: (1045+3) x 307 = 321736
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1.
- x:45+206=780
x:45=780-206
x:45=574
x=574 x 45
x=25830
- 9086 -X x 9=3947
X x 9=9086-3947
X x 9=5139
X=5136 :9
X=571
- (x-4350): 705=8682
x-4350=8682 x 705
x -4350=6120810
x=6120810 + 4350
x=6125160
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Gọi thừa số thứ nhất là a
thừa số thứ hai là b
Theo bài ra ta có:
a x 5 x b x 1/10 = 4350
a x b x 5 x 1/10 = 4350
a x b x 1/2 = 4350
a x b = 4350 x 1/2
a x b = 2175
Đ/S: 2175
_HT_
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705 x 82 + 705 x 19 - 705 x 1
= 705 x ( 82 + 19 - 1 )
= 705 x 100
= 70500
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1. Câu hỏi kêu tìm số không rõ nên không giải được!
2. 705 dư 31
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a) 132 + 76 + 868 + 524 + 500
= (132 + 868) + (76 + 524) + 500
= 1000 + 600 + 500
= 2100
b) 200 - 201 + 202 - 203 + 204 - 205 + 206 - 207 + 208 - 209 + 210
= (200 + 210) + (-201 - 209) + (202 + 208) + (-203 - 207) + (204 + 206) - 205
= 410 - 410 + 410 - 410 + 410 - 205
= 0 + 0 + 205
= 205
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a, 29+132+237+868+763
= 29+(132+868)+(237+763)
= 29+1000+1000 =2029
b, 652+327+148+15+73
= (652+148)+(327+73)+15
= 800+400+15 =1215
c, 347+418+123+12
= (347+123)+(418+12)
= 470+430 =900
\(\left(b-4350\right):705=868\)
\(b-4350=705.868\)
\(b-4350=611940\)
\(b=611940+4350\)
\(b=616290\)