Tính nhanh: a) 51 – 27 + 57 - 11
b) 85 – 26 + 76 - 35
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`@` `\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
a,21.35-3.26.7
=735-546
=189
b,77-11.(30+7)
=77-407
=-330
c,85.(36-27)-35.(86-27)
=85.9-35.59
=765-2065
=1300
d,47.(43-15)-47.(45+15)
=47.28-47.60
=47.(28-60)
=47.(-32)=-1504
b: \(305+\left(-105\right)+\left(-246\right)+546\)
\(=200+300\)
=500
c: \(435+\left(-43\right)+\left(-483\right)+\left(-57\right)+383+\left(-415\right)\)
\(=20-100-100\)
=-180
d: \(1316+317+\left(-1216\right)+\left(-315\right)+\left(-85\right)\)
\(=100-2-85\)
=13
a,= (45-35)+(-28+27+11)-6=10+10-6=14
b,=(305-105)+(-246+546)=200+300=500
c,= (435-415)+(-43-57)+(-483+383)=20-100-100=-180
d,=(1316-1216)+(317-315-85)= 100-83= 17
\(\dfrac{51}{85}=\dfrac{39}{65}\)
\(\dfrac{15}{21}=\dfrac{25}{35}\)
a: 51-27+57-11
=51-11+57-27
=40+30
=70
b: 85-26+76-35
=85-35+76-26
=50+50
=100
a)51-27+57-11
=51-11+57-27
=40+30
=70
b)85-26+76
=85+50
=135