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b) 15*8-20=100
c) 210/3+15=85
d) 12*8-26=70
e) 56/2+12=40
f) 343/7+1=50
g) 51/3+6*3=35
h) 35*4-5*8=100
a)
El numero que falta lo llamas x
400/x + 2 = 10
400/x = 10 - 2
400/x = 8
400 = 8x
400/8 = x
50 = x
400/50 + 2 = 10
b)
15 * x - 20 = 100
15x = 100 + 20
15x = 120
x = 120/15
x = 8
15 * 8 - 20 = 100
c)
210/3 + x = 85
70 + x = 85
x = 85 - 70
x = 15
d)
12 * 8 - x = 70
96 - x = 70
96 - 70 = x
26 = x
12 * 8 - 26 = 70
e)
x/2 + 12 = 40
x/2 = 40 - 12
x/2 = 28
x = 28 * 2
x = 56
56/2 + 12 = 40
f)
x/7 + 1 = 50
x/7 = 50 - 1
x/7 = 49
x = 49 * 7
343
343/7 + 1 = 50
g)
51/3 + x * 3 = 35
17 + 3x = 35
3x = 35 - 17
3x = 18
x = 18/3
x = 6
51/3 + 6 * 3 = 35
h)
35 * 4 - 5 * x = 100
140 - 5x = 100
140 - 100 = 5x
40 = 5x
40/5 = x
8 = x
35 * 4 - 5 * 8 = 100