145.
1)=5.72(0.24-0.14)=5.72×0.1=0.572
2)=3.04(1.33-1.32)=3.04×0.01=
=0.0304
3)=7.83(10×0.26+7.4)=
=7.83(2.6+7.4)=7.83×10=78.3
4)=3.43(0.67-0.57)=3.43×0.1=0.343
5)=5.06(0.25-0.24)=5.06×0.01=
=0.0506
6)=6.24(10×0.17+8.3)=
=6.24(1.7+8.3)=62.4
146
1)
х-5.6=3.7×12
х-5.6=44.4
х=44.4+5.6
х=50
2)
9х=3.4-1.6
9х=1.8
х=1.8÷9
х=0.2
3)
х+2.1=15.2÷4
х+2.1=3.8
х=3.8-2.1
х=1.7
4)
8.1÷х=0.3+0.7
8.1÷х=1
х=8.1
147.
5.1-0.7=4.4 км/ч скорость второго
5.1+4.4=9.9 км/ч скорость сближения
9.9×0.8=7.92км расстояние