1. 396 004 416 - (200 300 400 - 88 333 567 ) =
= 396 004 416 - 200 300 400 + 88 333 567 =
= 284 037 583
396 004 416
- 200 300 400
+ 88 333 567
===========
284 037 583
2)
а) 68 *51 -2368 = 1100
1) 68*51 =3468
2) 3468 - 2368 = 1100
б) 52 + 48*702 =33748
1) 48*702 = 33696
2) 52 + 33 696 = 33748
3)
a)138+x+57=218
195+x=218
x= 218-195
x=23
=====
138+23+57=218
218=218
б) 248-(y+123) =24
248-у -123=24
125-у=24
у=125-24
у= 101
========
248 - (101 +123 ) =24
248 - 224 = 24
24=24
4)
а) 38*4*25 = 38*100 = 3800
б) 125*79*8 = 79 * (125*8)= 79*1000= 79000