Đáp án:
a, 4,25 × 57,43 - 325 + 42,57 × 4,25
= 4,25 × 57,43 + 42,57 × 4,25 - 325
= 4,25 × (57,43 + 42,57) - 325
= 4,25 × 100 - 325
= 425 - 325
= 100
b,`\frac{12}{50}` + 8% + `\frac{59}{100}`+ 9%
= `\frac{24}{100}` + 8% + `\frac{59}{100}`+ 9%
= 24% + 8% + 59% + 9%
= 100 %
c, 4,14 : 3,17 + 5,37 : 3,17 - 3
= ( 4,14 + 5,37) : 3,17 - 3
= 9,51 : 3,17 - 3
= 3 - 3
= 0