Question

1)1 7/48 *2/5-(9 1/6*4/15+2 5/9)*2/5
2)(2 1/4 +4 5/6):3 2/5+3/4:3/5

3)(4 2/5*5/8+12 1/7:4 5/6-8 1/2:14):33/56

4)3,04:1/30-16,03:7/20)*1/5+00,72*1,3

5)(9/14-(-5/21)):(-2 9/14)

6)(7/16-31/40):(-17/24-27/40)

7)-3 3/4-(-8 2/9-(-4,5):9/14)*2 1/4
ПРОШУ ПОМОГИТЕ

Answer 1

Ответ:

Объяснение:

1) 1 7/48·2/5 -(9 1/6·4/15 +2 5/9)·2/5=55/48 ·2/5 -(55/6 ·4/15 +2 5/9)·2/5=11/24 -(22/9 +23/9)·2/5=11/24 -1 24/24=-1 13/24

2) (2 1/4+4 5/6)÷3 2/5+3/4 ÷3/5=(2 3/12+4 10/12)·5/17 +3/4 ·5/3=85/12 ·5/17 +5/4=25/12 +15/12=3 1/3

3) (4 2/5·5/8 +12 1/7÷4 5/6-8 1/2÷14) ÷33/56=(22/5 ·5/8 +85/7 ·6/29 -17/2 ·1/14)·56/33=(11/4 +510/203 -17/28)·56/33=(77/28 -17/28+510/203)·56/33=(15/7 +510/203)·56/33=(435/203 +510/203)·56/33=135/29 ·56/33=2520/319=7 287/319

4) (3,04 ÷1/30 -16,03 ÷7/20)·1/5 +0,72·1,3=(76/25 ·30 -1603/100 ·20/7)·1/5 +18/25 ·13/10=(456/5 -229/5)·1/5 +117/125=227/5 ·1/5 +117/125=9 10/125 +117/125=10 2/125=10,016

5) (9/14 -(-5/21))÷(-2 9/14)=(27/42 +10/42)·(-14/37)=37/42 ·(-14/37)=-1/3

6) (7/16 -31/40)÷(-17/24 -27/40)=(35/80 -62/80)÷(-85/120 -81/120)=-27/80 ·(-60/83)=81/332

7) -3 3/4-(-8 2/9 -(-4,5) ÷9/14)·2 1/4=-3 3/4-(-74/9 +9/2 ·14/9)·9/4=-3 3/4-(-74/9 +63/9)·9/4=-3 3/4+11/9 ·9/4=-15/4 +11/4=-1