2.step1: value of x and y; step2: is x<y? yes, jump to the end; step3: x=1/2x, y=y; step4: is x<y? if no, back to the step 1.
step 5: final value of x, y.
这⾥给出了x=100, y=3,问要经过多少次最后才能去到step5. A. 4 B.5 C.6 D.7 E.8
3.⼀个⼈调配了8 liters的40%浓度的⼀个东西,调配过程中⽤了2 liters的20%浓 度的材料,⽤了q liters的10%的材料和p liters50%的材料,问p=? A. 4 B. 4.5 C. 5 D. 5.5 E. 6