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76 x 102 - 76 - 76
=76 x 102 - 76 x 1 - 76 x 1
=76 x (102-1-1)
=76 x 100
=7600
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1:
Đổi 1 giờ 45phút=105 phút
Trong 1 phút vòi nước chảy được:
120:5=24 (lít nước)
Vòi chảy trong 105 phút được số lít nước là:
105.24=2520 (lít nước)
Đ s:
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`A)`
`37 \times 46+37 \times 51+111`
`= 37 \times (46+51)+111`
`= 37 \times 97+111`
`= 3589 +111`
`= 3700`
`B)`
`35 \times 215-35 \times 210-175`
`= 35 \times (215-210)-175`
`= 35 \times 5-175`
`= 175-175=0`
`E)`
`76 \times 102-76 \times 2`
`= 76 \times (102-2)`
`= 76 \times 100`
`= 7600`
`C)`
`85 \times 94+85 \times 2 +170 \times 2`
`= 85 \times (94+2) + 170 \times 2`
`= 85 \times 96+170 \times 2`
`= 8160+340`
`= 8500`
`48 \times 56+28 \times 104`
`= 48 \times 28 \times 2+28 \times 104`
`= 28 \times (48 \times 2+104)`
`= 28 \times (96+104)`
`= 28 \times 200`
`= 5600`
`G)`
`206 \times 12-206-206`
`= 206 \times (12-1-1)`
`= 206 \times 10`
`= 2060`
a) 37 x 46 + 37 x 51 + 111
= 37 x ( 46 + 51 ) + 111
= 37 x 97 + 111
= 3589 + 111
= 3700
b) 35 x 215 - 35 x 210 - 175
= 35 x ( 215 - 210 ) - 175
= 35 x 5 - 175
= 175 - 175
= 0
e) 76 x 102 - 76 x 2
= 76 x ( 102 - 2 )
= 76 x 100
= 7600
c) 85 x 94 + 95 x 2 + 170 x 2
= 7990 + 2 x ( 95 + 170 )
= 7990 + 2 x 265
= 7990 + 530
= 8520
48 x 56 + 28 x 104
= 2688 + 2912
= 5600
g) 206 x 12 - 206 - 206
= 2472 - 206 - 206
= 2266 - 206
= 2060
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 102 = 203 (dư 101)
x = 203 x 102 + 101
x = 20 706 + 101
x = 20 807
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a ) y : 102 = 203 ( dư 101 )
y=203x102+101
y=20 706+101
y=20 807
b ) 25 x y x 4 = 500
25xy=500:4
25xy=125
y=125:25
y=5
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 137 x 7 + 137 x 93
= 137 x ( 93 + 7 )
= 137 x 100 = 13700
b) 428 x 102 - 428 x 2
= 428 x ( 102 - 2 )
= 428 x 100
= 42800
c) 124 x 25 - 25 x 24
= 25 x ( 124 - 24 )
= 25 x 100
= 2500
_HỌC TỐT_
a) 137 x 7 + 137 x 93
\(=137\times\left(7+93\right)\\ =137\times100\\ =13700\)
b) 428 x 102 - 428 x 2
\(=428\times\left(102-2\right)\\
=428\times100\\
=42800\)
c) 124 x 25 - 25 x 24
\(=25\times\left(124-24\right)=\\ 25\times100=2500\)
#Châu's ngốc
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14586 : x = 36 ( du 6 )
x= 14586 : 36 - 6
x = 400
dung do ban
![](https://rs.olm.vn/images/avt/0.png?1311)
X ; 321 = 102
X = 102 x 321
X =57138
57,138