Question

Calculează respectând regulile învățate 13 X 4 -72:2 96:4x3-48:2x2. 924-5 x (45:3+7x24) Ex 2 : afla numărul x 214+x=5003 823-x=597 X-198=5718 B.X x 5=85 X:8=165 90:x=. 9

Answer 1

1)

13×4-72:2=52-16=36

96:4×3-48:2×2=24×3:48:2×2=72-48:2×2=72-48=24

924-5×(45:3+7×24)=924-5×(15+168)=924-5×183=924-915=9

2)

214+x=5003

x=5003-214=4789

823-x=597

-x=597-823=-226

x=226

x-198=5718

x=5718+198=5916

x×5=85

5x=85

$x = \frac{85}{5} = 17$

x:8=165

x=165×8=1320

90:x=9

90=9x

$\frac{90}{9} = x$

10=x

x=10