3) (440 + 280) : 9 + 30 = 4) 6.(210-170) + 260 = 5) 4.50 +5.40 = 6) 200: 2:5+ 960 = 7) 810:9:9+ 170 = 8) 60.5.3- 480 = 1) (500 + 20.3): 7 = 2) (800 - 20.4): 9 = 3) 900 - 400:2:4 = 4) (500 - 200.2): 5 = 5) 6-30 +6.60 = 6) 800 - (300: 3 + 540) = 7) (650 + 160): 9 + 120 = 8) (350 + 140): 7 + 230 = 1) (90.3 +130) : 5 = 2) (200+80.2): 4 = 3) 120-20-5 +690 = 4) (700-420): 4 + 50 5) (900-270):7-70 => 6) 480:6+420 : 7 => 7) 4.50-180:6- 8) (400-450 : 9): 7-

Выполним вычисления: 3) (440 + 280) : 9 + 30 = 720 : 9 + 30 = 80 + 30 = 110 4) 6 * (210 - 170) + 260 = 6 * 40 + 260 = 240 + 260 = 500 5) 4 * 50 + 5 * 40 = 200 + 200 = 400 6) 200 : 2 : 5 + 960 = 100 : 5 + 960 = 20 + 960 = 980 7) 810 : 9 : 9 + 170 = 90 : 9 + 170 = 10 + 170 = 180 8) 60 * 5 * 3 - 480 = 300 * 3 - 480 = 900 - 480 = 420 Упражнение 4 1) (500 + 20 * 3) : 7 = (500 + 60) : 7 = 560 : 7 = 80 2) (800 - 20 * 4) : 9 = (800 - 80) : 9 = 720 : 9 = 80 3) 900 - 400 : 2 : 4 = 900 - 200 : 4 = 900 - 50 = 850 4) (500 - 200 * 2) : 5 = (500 - 400) : 5 = 100 : 5 = 20 5) 6 * 30 + 6 * 60 = 180 + 360 = 540 6) 800 - (300 : 3 + 540) = 800 - (100 + 540) = 800 - 640 = 160 7) (650 + 160) : 9 + 120 = 810 : 9 + 120 = 90 + 120 = 210 8) (350 + 140) : 7 + 230 = 490 : 7 + 230 = 70 + 230 = 300 Упражнение 5 1) (90 * 3 + 130) : 5 = (270 + 130) : 5 = 400 : 5 = 80 2) (200 + 80 * 2) : 4 = (200 + 160) : 4 = 360 : 4 = 90 3) 120 - 20 * 5 + 690 = 120 - 100 + 690 = 20 + 690 = 710 4) (700 - 420) : 4 + 50 = 280 : 4 + 50 = 70 + 50 = 120 5) (900 - 270) : 7 - 70 = 630 : 7 - 70 = 90 - 70 = 20 6) 480 : 6 + 420 : 7 = 80 + 60 = 140 7) 4 * 50 - 180 : 6 = 200 - 30 = 170 8) (400 - 450 : 9) : 7 = (400 - 50) : 7 = 350 : 7 = 50