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7 x X = 4942 X: 5 = 1308
X = 4942 : 7 X = 1308 x 5
X = 706 X = 6540
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a) X x 4 = 2048
X = 2048 : 4
X = 412
b) 5 x X = 3055
X = 3055 : 5
X = 611
c) X x 6 = 4278
X = 4278 : 6
X = 713
d) 7 x X = 5691
X = 5691 : 7
X = 813
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Bài 3a) 576 + 678 + 780 - 475 - 577 - 679
= ( 578 - 475 ) + ( 678 - 577 ) + ( 780 - 679 )
= 103 + 101 + 101
= 305
b) ( 126 + 32 ) x ( 18 - 16 - 2 )
= 158 x 0
= 0
c) 36 x 17 + 12 x 34 + 6 x 30
= 6 x 6 x 17 + 6 x 2 x 34 + 6 x 30
= 6 x 102 + 6 x 68 + 6 x 30
= 6 x ( 102 + 68 + 30 )
= 6 x 200
= 1200
Bài 4:a. x × 6 = 3048 : 2
x × 6 = 1524
x = 1524 : 6
x = 254
b. 56 : x = 1326 – 1318
56 : x = 8
x = 56 : 8
x = 7
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a) X x 6 = 1266
X = 1266 : 6
X = 211
b) 7 x X = 2884
X = 2884 : 7
X = 412
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a) (x + 52400) : 5 = (52400 + 340) : 5
x = 340
b) ( x – 5480) × 6 = (6800 – 5480) × 6
x = 6800.
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a) x x 4 = 912
x = 912 : 4
x = 228
b) x : 3 = 248
x = 248 x 3
x = 744
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a) 1996 + x = 2002
x = 2002 - 1996
x = 6
b) x x 3 = 9861
x = 9861 : 3
x = 3287
c) x : 4 = 250
x = 250 x 4
x = 1000
a) X x 4 = 1608
X = 1608 : 4
X = 402
b) 7 x X = 4942
X = 4942 : 7
X = 706