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`a, 261 + 414=675`
`b, 595 -17=578`
`c, 286 : 2=143`
`d,310 xx 3=930`
`e, 265 - 82 +10=183+10=193`
`g, 21 xx 4 : 2= 84 : 2=42`
a)261 + 414 = 675
B) 595 - 17 = 578
c) 286 : 2 = 143
D) 310 x 3 = 930
E) 265 - 82 + 10 = 183 + 10 = 193
G) 21 x 4 : 2 = 84 : 2 = 42
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a)
8 103 × 5 – 4 135
= 40 515 – 4 135
= 36 380
b)
24 360 : 8+ 9 600
= 3045 + 9 600
= 12 645
c)
839 + 6 215 × 4
= 839 + 24 860
= 25 699
d)
17 286 – 45 234 : 9
= 17 286 – 5 026
= 12 260
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X x 2 x 3 = 1056
X x 6 = 1056
X=1056:6
X=176
X x 2 x 4 =1960
Xx6=1906
x=1906:6
x=953/3
X x 5 + 148 = 1338
Xx5=1338-148
Xx5=1190
X=1190:5
X=238
500 + X x 4 =940
X x4=940-500
Xx4=440
X=440:4
X=110
1.X * 2 * 3 = 1056
X =1056 : 3 : 2
X=176
2.X*2*4=1960
=1960 : 4 :2
=245
3.X * 5 + 148=1338
=(1338 - 148):5
=238
4.500 + X * 4 = 940
500 + X = 940 : 4
500 + X =235
X =235 - 500
X = -265
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a) 417 – (37 – 20) = 417 – 17
= 400
b) 826 – (70 + 30) = 826 – 100
= 726
c) 148 : (4 : 2) = 148 : 2
= 4
d) ( 30 + 20) x 5 = 50 x 5
= 250
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a, 4130 + 4130 + 4130 + 319 + 319 + 319
= 4130 × 3 + 319 × 3
= (4130 + 319) × 3
= 4449 × 3
= 13347
b, 1052 + 1052 – ( 286 + 286 + 286)
= 1052 × 2 – 286 × 3 = 2104 – 858
= 1246
c, 2020 + 2020 + 2010 + 2010 + 56 + 56
= 2020 × 2 + 2010 × 2 + 56 × 2
= (2020 + 2010 + 56) × 2
= 4086 × 2
= 8172
d, 2830 + 2830 + 2830 + 2830 +2830 = 2830 × 5 = 14150a
148+x:4=286
x:4=286-148
x:4=138
x=138*4
x=552
tk minh nha
148+x:4 = 286
=> x:4 = 286 - 148 = 138
=> x = 138 x 4
=> x = 552