有理数的乘法,36*(1/4-2/3-5/6) (3/10-1/4+4/5)*(-20)

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有理数的乘法,36*(1/4-2/3-5/6) (3/10-1/4+4/5)*(-20)

有理数的乘法,36*(1/4-2/3-5/6) (3/10-1/4+4/5)*(-20)
有理数的乘法,
36*(1/4-2/3-5/6) (3/10-1/4+4/5)*(-20)

有理数的乘法,36*(1/4-2/3-5/6) (3/10-1/4+4/5)*(-20)
36*(1/4-2/3-5/6)
=36*1/4-36*2/3-36*5/6
=9-24-30
=-45
(3/10-1/4+4/5)*(-20)
= -20*3/10+20*1/4-20*4/5
=-6+5-16
=-17

36*(3/12-8/12-10/12) =-6+5-16
=36*-15/12 =-17
=-60

(1),=36×(1/4)—36×(2/3)—36×(5/6)
=9-24-30
=﹣45
(2),=(3/10)*(-20)-(1/4)*(-20)+(4/5)*(-20)
=(-6)-(-5)+16
=15