0.8×2⼀12+4.8乘括号-2⼀7括号除以2.2÷3⼀7加0.8×9⼀11等于多少?

2024-12-01 07:55:03
推荐回答(2个)
回答1:

0.8×2/12+4.8×(-2/7)÷2.2÷3/7+0.8×9/11
=4/5×1/6-24/5×(2/7×7/3)÷11/5+4/5×9/11
=2/15-(24/5×5/11)×2/3+36/55
=2/15-(16/11-36/55)
=2/15-(80-36)/55
=2/15-44/55
=2/15-4/5
=2/15-12/15
=-10/15
=-2/3

回答2: