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(-5/12)×8/15÷(-2/3)

13/15-[(1/2)÷5/12-2/3] =13/15-[(1/2)×12/5-2/3] =13/15-(6/5-2/3) =13/15-(18/15-10/15) =13/15-8/15 =5/15 =1/3

(8/15-2/5)÷12 =(8/15-6/15)÷12 =2/15÷12 =2/15×1/12 =1/90

简便不了,只能按照运算顺序进行计算。::

8/15*[(3/4-1/2)÷3/5】 =8/15×【1/4÷3/5] =8/15×5/12 =2/9

(12-3/5)÷7/15+2/7 =57/5÷7/15+2/7 =57/5×15/7+2/7 =171/7+2/7 =173/7

第一个题要是能写清楚点就好了 感觉有点乱 不过按顺序一一算能算出来 3/4×【(7/15-1/5)÷2/3】=3/4×3/2×(7/15-1/5) =3/4×3/2×(7/15-3/15) =3/4×3/2×4/15 = 3/10 3/5×(1/7+8/21÷2/3)=3/5×(1/7+4/7) =3/5×5/7=3/7 (2/3-3/4×1/3)÷5...

(-1/2+1/6-3/4+5/12)÷(-12) =(-6/12+2/12-9/12+10/12)÷(-12) =-3/12÷(-12) =-1/4÷(-12) =1/48

收到了吗?

(1)原式=12+18-7-15=8(2)原式=27+40=67(3)原式=-4×(-12)+8÷4=4(4)原式=1-2+5-5=-1(5)原式=100÷4-3-8=14(6)原式=-18-58=-34(7)原式=a2+4ab-ab+a2-2ab=2a2+ab.

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