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5/14×21/25×3/4计算.

原式=(5×21×3)/(14×25×4)=(3×3)/(2×5×4)=9/40

=1/14×21/5×3/4 =21/70×3/4 =63/280

=5/14*7/5*21/25 =1/2*21/25 =21/50

亲,记得给好评哦

⒈ (-9)-(-13)+(-20)+(-2) ⒉(-2)-8-14-13 ⒊ (-1)×(-1)+15+1 ⒋ 6×(-14)-(-14)+(-13) ⒌ (-15)×(-13)-(-17)-(-4) ⒍(-13)-(-9)×16×(-12) ⒎ (-1)+4×19+(-2) ⒏(-17)×(-9)-20+(-6) ⒐ (-3)-13×(-5)×13 ⒑5+(-7)+17-10 ⒒(-10)-(-16)-13×(-16) ⒓(-14)+4-19-1...

5/14×21/25 = 1/2×3/5 = 3/10

=15/8*16/25 =6/5

脱式计算 25/21-(5/14-2/7) =25/21-1/14 =47/42

27÷3×7 3×6÷9 25÷5×8 45+8-23 63÷7×8 24-8+10 28÷4×7 35+24-12 48÷8×9 9405-2940÷28×21 920-1680÷40÷7 690+47...

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