42/28=1,5
54/81= 2*27/3*27=2/3
85\55=<span>17·5/11·5</span> = <span>17/11</span> = <span>6 + 1·11/11</span> = 1 <span>6/<span>11 одна целая
</span></span>360\30= <span>12·30/30</span><span> = 12
</span>210\105=<span>2·105/105</span><span> = 2
</span>600\1400=<span>3·200/7·200</span> = <span>3/<span>7
</span></span>162\135=<span>6·27/5·27</span> = <span>6/5</span> = <span>1 + 1·5/5</span> = 1 <span>1/<span>5
</span></span>500\375= <span>4·125/3·125</span> = <span>4/3</span> = <span>1 + 1·3/3</span> = 1 <span>1/<span>3</span></span>
1) 60+90=150 км/ч - общая скорость или скорость сближения
2) 750:150=5 часов - через столько они встретятся.
8*4+2=34
8+(4-2)=10
8/4+2=4
8+4+2=14
8/4/2=1
8*4-2=30
8*(4+2)=48
8*4*2=64
1) 1803200:400=4508
2) 5796+4508=10304
3) 10304*8=82432
4) 240400-82432=157968