№1
0.907*56=50.792
1.45*48=69.8
6.536:76=0.086
15:48=0.3125
№2
40-24*(40.6:29)=6.4
1)40.6:29=1.4
2)24*1.4=33.6
3)40-33.6=6.4
№3
1)6*0.4=2.4м-на 6 юбок.
2)3.6-2.4=1.2м-на 4 блузки.
3)1.2:4=0.3м-на 1 блузку.
№4
6у+3.7=38.5
6у=38.5-3.7
6у=34.8
у=34.8:6
у=5.8
(2.8+х):9=0.8
2.8+х=0.8*9
2.8+х=7.2
х=7.2-2.8
х=4.4