分数计算题咋做?（打※要过程）7.8-（2.8+3 - 知识问答

分数计算题咋做?（打※要过程）7.8-（2.8+3又5/7）=5.2×3/8+4.625×5又1/5=※1-3/8÷3×

1个回答

7.8-(2.8+3又5/7)
=(7.8-2.8)-3又5/7
=5-3又5/7
=1又2/7
5.2×3/8+4.625×5又1/5
=26/5×3/8+37/8×26/5
=26/5×(3/8+37/8)
=26/5×5
=26
1-3/8÷3×2/3
=1-3/8×1/3×2/3
=1-1/8×2/3
=1-1/12
=11/12
8÷2/11×125℅
=8×11/2×5/4
=11×5
=55

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