1.=7*(7+1/7+7+1/7)-(7+1/7+7+1/7)=49+49+2-14-2/7=87+5/7
2.=125/1000*(4/100)*4*25=125*4/1000=125*8/2000=1/2
3.=3/4*12+2/3*12=9+8=17
1.=7*(7+1/7+7+1/7)-(7+1/7+7+1/7)=49+49+2-14-2/7=87+5/7
2.=125/1000*(4/100)*4*25=125*4/1000=125*8/2000=1/2
3.=3/4*12+2/3*12=9+8=17